RVS_SOLUTIONS: First Yr R19 Lab Excecises

C programming Lab :-

EXERCISE-1

1. Write a C program to print a block F using hash (#), where the F has a height of six characters and width of five and four characters.
2. Write a C program to compute the perimeter and area of a rectangle with a height of 7 inches and width of 5 inches.
3. Write a C program to display multiple variables.

1. Write a C program to print a block F using hash (#), where the F has a height of six characters and width of five and four characters.

SOURCE CODE:

#include<stdio.h>
int main(){
printf("#####\n");
printf("#\n");
printf("#\n");
printf("####\n");
printf("#\n");
printf("#\n");
return 0;
}
OUTPUT:
#####
#
#
####
#
#

2. Write a C program to compute the perimeter and area of a rectangle with a height of 7 inches and width of 5 inches.
SOURCE CODE:
#include<stdio.h>
int main(){
float length, width, area, perimeter;
printf("Enter the length and width of the rectangle : ");
scanf("%f%f",&length,&width);
area = length*width;
perimeter = 2*(length+width);
printf("Area of rectangle : %f square inches\n",area);
printf("Perimeter of rectangle : %f inches\n",perimeter);
return 0;
}
OUTPUT:
Enter the length and width of the rectangle : 7 5
Area of rectangle : 35.000000 square inches
Perimeter of rectangle : 24.000000 inches

3. Write a C program to display multiple variables.
SOURCE CODE:
#include<stdio.h>
int main(){
int i;
short int si;
long int li;
float f;
double d;
long double ld;
char c;
printf("Enter int, short int and long int values : ");
scanf("%d%hd%ld",&i,&si,&li);
printf("Enter float, double and long double values : ");
scanf("%f%lf%Lf",&f,&d,&ld);
printf("Enter a character : ");
scanf(" %c",&c);
printf("Given int value : %d\n",i);
printf("Given short int value : %hd\n",si);
printf("Given long int value : %ld\n",li);
printf("Given float value : %f\n",f);
printf("Given double value : %lf\n",d);
printf("Given long double value : %Lf\n",ld);
printf("Given character : %c\n",c);
return 0;
}
OUTPUT:
Enter int, short int and long int values : 12345 123 1234567
Enter float, double and long double values : 1.2 3.14 9.334
Enter a character : G
Given int value : 12345
Given short int value : 123
Given long int value : 1234567
Given float value : 1.200000
Given double value : 3.140000
Given long double value : 9.334000
Given character : G

EXERCISE-2

1. Write a C program to calculate the distance between the two points.
SOURCE CODE:

#include<stdio.h>

#include<math.h>

int main(){
 float x1,x2,y1,y2,dist;
 printf("Enter x1 and x2 : ");
 scanf("%f%f",&x1,&x2);
 printf("Enter y1 and y2 : ");
 scanf("%f%f",&y1,&y2);
 dist = sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
 printf("Distance between two points : %f\n",dist);
 return 0;

}
OUTPUT:

Enter x1 and x2 : 5 9

Enter y1 and y2 : 4 8

Distance between two points : 5.656854

2. Write a C program that accepts 4 integers p, q, r, s from the user where r and s are positive and p is even. If q is greater than r and s is greater than p and if the sum of r and s is greater than the sum of p and q print "Correct values", otherwise print "Wrong values".
SOURCE CODE:

#include<stdio.h>

int main(){

    int p,q,r,s;

    printf("Enter p,q,r,s values:");

    scanf("%d%d%d%d",&p,&q,&r,&s);

    if(r>0 && s>0 && p%2==0 && q>r && s>p && r+s>p+q)

        printf("Correct values");

    else

        printf("Wrong values");

    return 0;

}

OUTPUT-1:

Enter p,q,r,s values:4 8 2 13

Correct values

OUTPUT-2:

Enter p,q,r,s values:9 3 1 45

Wrong values

EXERCISE-3

1. Write a C program to convert a string to a long integer.

SOURCE CODE:

#include<stdio.h>

#include<stdlib.h>

int main(){

    long int l;

    char str[30];

    printf("Enter a string:\n");

    scanf("%s",str);

    l=atol(str);

    printf("String to long integer is : %ld",l);

    return 0;

}

OUTPUT:

Enter a string:

123456789

String to long integer is : 123456789

2. Write a program in C which is a Menu-Driven Program to compute the area of the various geometrical shape.

SOURCE CODE:

#include<stdio.h>

#include<stdlib.h>

int main(){

 float radius, length, width, base, height, area;

 int choice;

 do{

  printf("1. Area of circle\n2. Area of rectangle\n3. Area of triangle\n4. Exit\n");

  printf("Enter your choice : ");

  scanf("%d",&choice);

  switch(choice){

   case 1:

    printf("Enter radius : ");

    scanf("%f",&radius);

    area = 3.14 * radius * radius;

    printf("Area of circle : %f\n",area);

    break;

   case 2:

    printf("Enter length and width : ");

    scanf("%f%f",&length,&width);

    area = length * width;

    printf("Area of rectangle : %f\n",area);

    break;

   case 3:

    printf("Enter base and height : ");

    scanf("%f%f",&base,&height);

    area = (base*height)/2;

    printf("Area of triangle : %f\n",area);

    break;

   case 4:

    exit(0);

  }

 } while(1);

 return 0;

}

OUTPUT:

1. Area of circle

2. Area of rectangle

3. Area of triangle

4. Exit

Enter your choice : 1

Enter radius : 4

Area of circle : 50.240002

1. Area of circle

2. Area of rectangle

3. Area of triangle

4. Exit

Enter your choice : 2

Enter length and width : 4 8

Area of rectangle : 32.000000

1. Area of circle

2. Area of rectangle

3. Area of triangle

4. Exit

Enter your choice : 3

Enter base and height : 2 3

Area of triangle : 3.000000

1. Area of circle

2. Area of rectangle

3. Area of triangle

4. Exit

Enter your choice : 4

3. Write a C program to calculate the factorial of a given number.

SOURCE CODE:

#include<stdio.h>

int main(){

    int num,fact=1,i;

    printf("Enter a number: ");

    scanf("%d",&num);

    for(i=1;i<=num;i++)

        fact = fact*i;

    printf("Factorial of %d is %d",num,fact);

    return 0;

}

OUTPUT:

Enter a number: 5

Factorial of 5 is 120

EXERCISE-4

1. Write a program in C to display the n terms of even natural number and their sum.

SOURCE CODE:

#include<stdio.h>

int main(){

    int n,i=1,c=1,sum=0;

    printf("Enter number of terms : ");

    scanf("%d",&n);

    printf("Even natural numbers are : \n");

    while(c<=n){

        if(i%2==0){

            printf("%d ",i);

            sum=sum+i;

            c++;

        }

        i++;

    }

    printf("\nSum of even natural numbers is: %d\n",sum);

    return 0;

}

OUTPUT:

Enter number of terms : 5

Even natural numbers are :

2 4 6 8 10

Sum of even natural numbers is: 30

2. Write a program in C to display the n terms of harmonic series and their sum. 1 + 1/2 + 1/3 + 1/4 + 1/5 ... 1/n terms.

SOURCE CODE:

#include<stdio.h>

int main(){

    int n,i;

    float sum=0;

    printf("Enter range:");

    scanf("%d",&n);

    printf("Series is:\n");

    for(i=1;i<=n;i++){

        printf("1/%d",i);

        if(i<n)

            printf("+");

        sum = sum + (float)1/i;

    }

    printf("\nSum of series is: %f",sum);

    return 0;

}

OUTPUT:

Enter range:5

Series is:

1/1+1/2+1/3+1/4+1/5

Sum of series is: 2.283334

3. Write a C program to check whether a given number is an Armstrong number or not.

SOURCE CODE:

/*Program to check whether the given number is Armstrong number or not.*/

#include<stdio.h>

#include<math.h>

int main(){

    int n,temp,arm=0,c=0;

    printf("Enter number:");

    scanf("%d",&n);

    temp=n;

    while(temp>0){

        temp=temp/10;

        c++;

    }

    temp=n;

    while(temp>0){

        arm=arm+pow((temp%10),c);

        temp=temp/10;

    }

    if(n==arm)

        printf("Given number is Armstrong.");

    else

        printf("Given number is not Armstrong.");

    return 0;

}

OUTPUT-1:

Enter number:371

Given number is Armstrong.

OUTPUT-2:

Enter number:151

Given number is not Armstrong.

EXERCISE-5

1. Write a program in C to print all unique elements in an array.

SOURCE CODE:

#include<stdio.h>

int main(){

    int a[20],n,i,j,k;

    printf("Enter array size:");

    scanf("%d",&n);

    printf("Enter array elements:\n");

    for(i=0;i<n;i++)

        scanf("%d",&a[i]);

    for(i=0;i<n;i++){

        for(j=i+1;j<n;j++){

            if(a[i]==a[j]){

                for(k=j;k<n-1;k++)

                    a[k]=a[k+1];

                n--;

                j--;

            }

        }

    }

    printf("\nUnique elements in array are:\n");

    for(i=0;i<n;i++)

        printf("%d\t",a[i]);

    return 0;

}

OUTPUT:

Enter array size:5

Enter array elements:

1 2 3 2 1

Unique elements in array are:

1       2       3

2. Write a program in C to separate odd and even integers in separate arrays.

SOURCE CODE:

#include<stdio.h>

int main(){

    int arr[30],evenArr[30],oddArr[30],i,j=0,k=0,ea=0,oa=0,n;

    printf("Enter array size:");

    scanf("%d",&n);

    printf("Enter %d elements:\n",n);

    for(i=0;i<n;i++)

        scanf("%d",&arr[i]);

    for(i=0;i<n;i++){

        if(arr[i]%2==0)

            evenArr[j++]=arr[i];

        else

            oddArr[k++]=arr[i];

    }

    printf("Even elements in the array:\n");

    for(i=0;i<j;i++)

        printf("%d\t",evenArr[i]);

    printf("\nOdd elements in the array:\n");

    for(i=0;i<k;i++)

        printf("%d\t",oddArr[i]);

    return 0;

}

OUTPUT:

Enter array size:5

Enter 5 elements:

10 25 30 35 55

Even elements in the array:

10      30

Odd elements in the array:

25      35      55

3. Write a program in C to sort elements of array in ascending order.

SOURCE CODE:

#include<stdio.h>

int main(){

    int arr[20],n,i,j,temp;

    printf("Enter array size:");

    scanf("%d",&n);

    printf("Enter %d elements:\n",n);

    for(i=0;i<n;i++)

        scanf("%d",&arr[i]);

    printf("Before sorting array elements are:\n");

    for(i=0;i<n;i++)

        printf("%d\t",arr[i]);

    for(i=0;i<n-1;i++){

        for(j=i+1;j<n;j++){

            if(arr[i]>arr[j]){

                temp=arr[i];

                arr[i]=arr[j];

                arr[j]=temp;

            }

        }

    }

    printf("\nAfter sorting array elements are:\n");

    for(i=0;i<n;i++)

        printf("%d\t",arr[i]);

    return 0;

}

OUTPUT:

Enter array size:5

Enter 5 elements:

3 4 2 5 1

Before sorting array elements are:

3       4       2       5       1

After sorting array elements are:

1       2       3       4       5

EXERCISE-6

1. Write a program in C for multiplication of two square Matrices.

SOURCE CODE:

#include<stdio.h>

int main(){

    int mtrx1[20][20],mtrx2[20][20],mulmtrx[40][40],n1,n2,i,j,k;

    printf("Enter matrix sizes:");

    scanf("%d%d",&n1,&n2);

    if(n1==n2){

        printf("Enter first matrix elements\n");

        for(i=0;i<n1;i++)

            for(j=0;j<n1;j++)

                scanf("%d",&mtrx1[i][j]);

        printf("Enter second matrix elements\n");

        for(i=0;i<n2;i++)

            for(j=0;j<n2;j++)

                scanf("%d",&mtrx2[i][j]);

        for(i=0;i<n1;i++){

            for(j=0;j<n2;j++){

                mulmtrx[i][j]=0;

                for(k=0;k<n1;k++)

                    mulmtrx[i][j]=mulmtrx[i][j]+mtrx1[i][k]*mtrx2[k][j];

            }

        }

        printf("\nResult matrix is\n");

        for(i=0;i<n1;i++){

            for(j=0;j<n1;j++)

                printf("%d\t",mulmtrx[i][j]);

            printf("\n");

        }

    }

    else

        printf("Matrix multiplication is not possible");

    return 0;

}

OUTPUT-1:

Enter matrix sizes:3 3

Enter first matrix elements

1 2 3

4 5 6

7 8 9

Enter second matrix elements

9 8 7

6 5 4

3 2 1

Result matrix is

30      24      18

84      69      54

138     114     90

OUTPUT-2:

Enter matrix sizes:3 2

Matrix multiplication is not possible

2. Write a program in C to find transpose of a given matrix.

SOURCE CODE:

#include<stdio.h>

int main(){

    int mtrx[10][10],r,c,i,j,temp;

    printf("Enter matrix size:\n");

    scanf("%d %d",&r,&c);

    printf("Enter matrix elements:\n");

    for(i=0;i<r;i++)

        for(j=0;j<c;j++)

            scanf("%d",&mtrx[i][j]);

    if(r>=c){

     for(i=0;i<c;i++){

         for(j=0;j<r;j++){

             if(j>i){

                 temp = mtrx[i][j];

                 mtrx[i][j] = mtrx[j][i];

                 mtrx[j][i] = temp;

             }

         }

     }

    }

    else{

     for(i=0;i<r;i++){

         for(j=0;j<c;j++){

             if(j>i){

                 temp = mtrx[i][j];

                 mtrx[i][j] = mtrx[j][i];

                 mtrx[j][i] = temp;

             }

         }

     }

    }

    printf("Transpose of the given matrix is\n");

    for(i=0;i<c;i++){

        for(j=0;j<r;j++)

            printf("%d ",mtrx[i][j]);

        printf("\n");

    }

    return 0;

}

OUTPUT-1:

Enter matrix size:

2 3

Enter matrix elements:

1 2 3

4 5 6

Transpose of the given matrix is

1 4

2 5

3 6

OUTPUT-2:

Enter matrix size:

3 2

Enter matrix elements:

1 2

3 4

5 6

Transpose of the given matrix is

1 3 5

2 4 6

La b 7.1

Aim:Search in a row wise and column wise sorted matrix

// C program to search an element in row-wise

// and column-wise sorted matrix

#include <stdio.h>

/* Searches the element x in mat[][]. If the

element is found, then prints its position

and returns true, otherwise prints "not found"

and returns false */

int search(int mat[4][4], int n, int x)

{

if (n == 0)

return -1;

int smallest = a[0][0], largest = a[n - 1][n - 1];

if (x < smallest || x > largest)

return -1;

int i = 0, j = n - 1; // set indexes for top right element

while (i < n && j >= 0) {

if (mat[i][j] == x) {

printf("\n Found at %d, %d", i, j);

return 1;

}

if (mat[i][j] > x)

j--;

else // if mat[i][j] < x

i++;

}

printf("n Element not found");

return 0; // if ( i==n || j== -1 )

}

// driver program to test above function

int main()

{

int mat[4][4] = {

{ 10, 20, 30, 40 },

{ 15, 25, 35, 45 },

{ 27, 29, 37, 48 },

{ 32, 33, 39, 50 },

};

search(mat, 4, 29);

return 0;

}

Output :

Found at 2, 1

La b 7.2

Aim:Write a program to print individual characters in reverse.

Solution :

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

void main()

{

char str[100]; /* Declares a string of size 100 */

int l,i;

printf("\n\nPrint individual characters of string in reverse order :\n");

printf("------------------------------------------------------\n");

printf("Input the string : ");

fgets(str, sizeof str, stdin);

l=strlen(str);

printf("The characters of the string in reverse are : \n");

for(i=l;i>=0;i--)

{

printf("%c ", str[i]);

}

printf("\n");

}

Output:

Input the string : w3resource.com

The characters of the string in reverse are :

  m  o  c  .  e  c  r  u  o  s  e  r  3  w

Lab 8.1
Aim: Write a c program to compare two strings without using library functions.

Solution :

# include <stdio.h>
main()
{
 char str1[100],str2[100];
 int L1,L2,i;
 printf("\nEnter string1 and string2?");
 scanf("%s%s",&str1,&str2);
 /* string1 length */
 for(L1=0;str1[L1]!=NULL;L1++);
 for(L2=0;str1[L2]!=NULL;L2++);
  if(L1==L2)
  {
   for(i=0;str1[i]!=NULL;i++)
   {
    if(str1[i]!=str2[i])
    break;
   }
   if(L1==i)
   printf("\nEqual strings");
   else
   printf("\nEqual in lengths");

  }
  else
  printf("\nUn equal strings");
}

Lab 8.2

Aim: Write a c program to copy one string to another string

Solution :

# include <stdio.h>
main()
{
 char str1[100],str2[100];
 int i;
 printf("\nEnter a string ?");
 scanf("%s",&str1);
 /*  string copying */
 for(i=0;str1[i]!=0 ; i++)
 {
  str2[i]=str1[i];
 }
 /* init NULL */
 str2[i]=NULL;

 puts("\nAfter copy ...");
 puts(str2);
}

Output :

Lab 9.1

Aim: Write a c program to store information using structures with dynamic memory allocation :

The following program uses Student structure to allocate dynamically memory to store sz number of students and to print all the student details

#include <stdio.h>

struct Student

{

int sno;

char sname[20];

};

int main()

{

struct Student *s;

int i,sz;

printf("Enter No of students to store ?");

scanf("%d",&sz);

/* memory allocation for sz number of students */

s=(struct Student*)malloc(sz*sizeof(struct Student));

/* reading students data */

for(i=0;i<sz;i++)

{

printf("\nEnter student%d number and name?",i+1);

scanf("%d%s",&(*(s+i)).sno,&(*(s+i)).sname);

}

puts("\nOutput");

for(i=0;i<sz;i++)

{

printf("\n%d %s",(*(s+i)).sno,(*(s+i)).sname);

}

return 0;

}

Output :

Enter No of students to store ?2

Enter student1 number and name?101 babe

Enter student2 number and name?102 Harish

Output

101 babe

102 Harish

...Program finished with exit code 0

Press ENTER to exit console.

Lab 9.2

Aim: Write a c program to demonstrate how to handle the pointers:

The following program uses sub function sum(int *,int ) to carry the reference, size and returns

The sum of digits

#include <stdio.h>

/* function to return sum of sz numbers from the starting address */

int sum(int*n,int sz)

{

int i,nsum=0;

for(i=0;i<sz;i++)

{

nsum+=*(n+i);

}

return nsum;

}

int main()

{

int no[100];

int i,sz,ns,numsum;

printf("\nEnter How many Number to Enter?");

scanf("%d",&sz);

printf("\nEnter %d numbers?",sz);

for(i=0;i<sz;i++)

scanf("%d",&no[i]);

printf("\nHow many first numbers to some?");

scanf("%d",&ns);

numsum=sum(no,ns);

printf("\n number sum = %d",numsum);

return 0;

}

Enter How many Number to Enter?5

Enter 5 numbers?12 23 34 45 11

How many first numbers to some?3

number sum = 69

Lab 10.1

Aim: Write a program to demonstrate the use of & (address of) , * (value at address)

Operator

In the following program iptr is initialized with first element address. And accessed the values using * operator.

#include <stdio.h>

int main()

{

int *iptr,no[10];

int i,sz;

printf("\nEnter How many Number to Enter?");

scanf("%d",&sz);

printf("\nEnter %d numbers?",sz);

for(i=0;i<sz;i++)

scanf("%d",&no[i]);

/* initializing first element address to iptr */

iptr=&no[0]; /* or iptr=no; */

puts("Elements in reverse..");

for(i=sz-1;i>=0;i--)

printf("%5d",*(iptr+i));

return 0;

}

Output ;

Enter How many Number to Enter?5

Enter 5 numbers?12 23 34 45 56

Elements in reverse..

56 45 34 23 12

Lab 10.2

Aim: Write a program in c two add two numbers using pointers

#include <stdio.h>

int main()

{

int first, second, *p, *q, sum;

printf("Enter two integers to add\n");

scanf("%d%d", &first, &second);

p = &first; q = &second;

sum = *p + *q;

printf("Sum of the numbers = %d\n", sum);

return 0;

}

Output:

Enter two integers to add

34 45

Sum of the numbers = 79

Lab 11.1

Aim: Write a program in c to add numbers using call by reference

The following program uses add function( add(int *,int ) ) to carry the reference, size and returns sum of numbers. The add function called by passing reference or address.

#include <stdio.h>

/* function to return sum of sz numbers from the starting address */

int add(int*n,int sz)

{

int i,nsum=0;

for(i=0;i<sz;i++)

{

nsum+=*(n+i);

}

return nsum;

}

int main()

{

int no[100];

int i,sz,ns,numsum;

printf("\nEnter How many Number to Enter?");

scanf("%d",&sz);

printf("\nEnter %d numbers?",sz);

for(i=0;i<sz;i++)

scanf("%d",&no[i]);

numsum=sum(&no[0],sz); /* sum called by passing reference */

printf("\n number sum = %d",numsum);

return 0;

}

Output :-

Enter How many Number to Enter?5

Enter 5 numbers?12 2 4 5 11

number sum = 34

Lab 11.2

Aim: Write a program in c to find the largest element using dynamic memory allocation.

#include <stdio.h>

# include <stdlib.h>

int main()

{

int *no;

int i,sz,large,index=0;

printf("\nEnter How many Number to Enter?");

scanf("%d",&sz);

/* dynamic memory allocation capable to store sz integers*/

no=(int*)malloc(sizeof(int) * sz);

printf("\nEnter %d numbers?",sz);

for(i=0;i<sz;i++)

scanf("%d",&no[i]);

/* finding largest element */

large=no[0];

for(i=1;i<sz;i++)

{

if(large<no[i]){

large=no[i];

index=i;}

}

printf("\n largest element is %d , value = %d",index+1,large);

return 0;

}

Output :-

Enter How many Number to Enter?5

Enter 5 numbers?12 23 44 3 11

largest element is 2 , value = 44

EXERCISE-12

1. Write a program in C to swap elements using call by reference.

SOURCE CODE:

#include<stdio.h>

int main() {

 int num1, num2;

 printf("Enter two integer values : ");

 scanf("%d %d", &num1, &num2);

 printf("Before swapping in main : num1 = %d \t num2 = %d\n", num1, num2);

 swap(&num1, &num2);

 printf("After swapping in main : num1 = %d \t num2 = %d\n", num1, num2);

 return 0;

}

void swap(int *num1, int *num2){

    int temp;

    temp = *num1;

    *num1 = *num2;

    *num2 = temp;

    printf("After swapping in swap : *num1 = %d \t *num2 = %d\n", *num1, *num2);

}

OUTPUT:

Enter two integer values : 5 6

Before swapping in main : num1 = 5       num2 = 6

After swapping in swap : *num1 = 6       *num2 = 5

After swapping in main : num1 = 6        num2 = 5

2. Write a program in C to count the number of vowels and consonants in a string using a pointer.

SOURCE CODE:

#include<stdio.h>

int main(){

 char str[100], *ch;

 int i, v=0, c=0;

 printf("Enter a string: ");

 scanf("%s",str);

 ch = str;

 while(*ch!='\0'){

  if(*ch=='a' || *ch=='e' || *ch=='i' || *ch=='o' || *ch=='u' || *ch=='A' || *ch=='E' || *ch=='I' || *ch=='O' || *ch=='U'){

   v++;

  }

  else{

   c++;

  }

  ch++;

 }

 printf("Total number of vowels : %d, consonants : %d\n",v,c);

 return 0;

}

OUTPUT:

Enter a string: welcometocprogramming

Total number of vowels : 7, consonants : 14

EXERCISE-13

1. Write a program in C to show how a function returning pointer.
SOURCE CODE:

#include<stdio.h>

int* findLarger(int*, int*);

int main() {
 int num1, num2;
 int *result;
 printf("Enter two numbers : ");
 scanf("%d %d", &num1, &num2);
 result = findLarger(&num1, &num2);
 printf("Largest number : %d\n" , *result);
 return 0;

}

int* findLarger(int *num1, int *num2){
 return *num1>*num2?num1:num2;

}
OUTPUT:

Enter two numbers : 4 6

Largest number : 6

2. Write a C program to find sum of n elements entered by user. To perform this program, allocate memory dynamically using malloc( ) function.
SOURCE CODE:

#include<stdio.h>

#include<stdlib.h>

int main(){

    int n, *eles, i, sum=0;

    printf("Enter number of elements : ");

    scanf("%d",&n);

    eles = (int*)malloc(sizeof(int)*n);

    printf("Enter %d elements : ",n);

    for(i=0;i<n;i++)

        scanf("%d",&eles[i]);

    for(i=0;i<n;i++)

        sum = sum + eles[i];

    printf("Sum of all elements is : %d\n",sum);

    return 0;

}
OUTPUT:

Enter number of elements : 4

Enter 4 elements : 2 6 1 5

Sum of all elements is : 14

EXERCISE-14

1. Write a C program to find sum of n elements entered by user. To perform this program, allocate memory dynamically using calloc( ) function. Understand the difference between the above two programs.

SOURCE CODE:

#include<stdio.h>

#include<stdlib.h>

int main(){

    int n, *eles, i, sum=0;

    printf("Enter number of elements : ");

    scanf("%d",&n);

    eles = (int*)calloc(n,sizeof(int));

    printf("Enter %d elements : ",n);

    for(i=0;i<n;i++)

        scanf("%d",&eles[i]);

    for(i=0;i<n;i++)

        sum = sum + eles[i];

    printf("Sum of all elements is : %d\n",sum);

    return 0;

}

OUTPUT:

Enter number of elements : 4

Enter 4 elements : 5 4 3 2

Sum of all elements is : 14

2. Write a program in C to convert decimal number to binary number using the function.

SOURCE CODE:

#include <stdio.h>

long decimalToBinary(int);

int main() {

 int d;

 long int b;

 printf("Enter a positive decimal number : ");

 scanf("%d", &d);

 b=decimalToBinary(d);

 printf("The binary number of decimal %d is : %ld\n", d, b);

 return 0;

}

long decimalToBinary(int d){

 long int bn=0, revbn=0;

 int c=0;

 while(d>0){

  revbn=(revbn*10)+(d%2);

  d=d/2;

  c++;

 }

 while(c>0){

  bn=(bn*10)+(revbn%2);

  revbn=revbn/10;

  c--;

 }

 return bn;

}

OUTPUT:

Enter a positive decimal number : 36

The binary number of decimal 36 is : 100100

EXERCISE-15

1. Write a program in C to check whether a number is a prime number or not using the function.
SOURCE CODE:

#include<stdio.h>

void isPrime(int);

int main(){

    int n;

    printf("Enter number : ");

    scanf("%d",&n);

    isPrime(n);

    return 0;

}

void isPrime(int n){

    int i, c=0;

    for(i=1;i<=n/2;i++){

        if(n%i==0)

            c++;

    }

    if(c==1)

        printf("Given number %d is a prime number.\n",n);

    else

        printf("Given number %d is not a prime number.\n",n);

}
OUTPUT-1:

Enter number : 5

Given number 5 is a prime number.

OUTPUT-2:

Enter number : 25

Given number 25 is not a prime number.

2. Write a program in C to get the largest element of an array using the function.
SOURCE CODE:

#include <stdio.h>

int large(int[], int);

int main() {
 int a[10], i, n;
 printf("Enter number of elements to be insert : ");
 scanf("%d", &n);
 printf("Enter %d elements : ",n);
 for (i = 0; i < n; i++)
  scanf("%d", &a[i]);
 printf("The largest element of the array = %d\n", large(a, n));
 return 0;

}

int large(int ary[], int n){
 int i, max;
 max=ary[0];
 for(i=1;i<n;i++){
  if(ary[i]>max)
   max=ary[i];
 }
 return max;

}
OUTPUT:

Enter number of elements to be insert : 4

Enter 4 elements : 8 3 4 2

The largest element of the array = 8

EXERCISE-16

1. Write a program in C to append multiple lines at the end of a text file.

SOURCE CODE:

#include<stdio.h>

int main() {

 FILE *fp;

 char ch;

 fp = fopen("Sample.txt", "w");

 printf("Enter the text press ctrl+z for end of file: \n");

 while ((ch=getchar())!=EOF) {

  putc(ch,fp);

 }

 fclose(fp);

 fp = fopen("Sample.txt", "a");

 printf("Enter the text to append to a file press ctrl+z for end of file: \n");

 while ((ch=getchar())!=EOF) {

  putc(ch,fp);

 }

 fclose(fp);

 fp = fopen("Sample.txt", "r");

 printf("File content after appending : \n");

 while ((ch=fgetc(fp))!=EOF) {

  putchar(ch);

 }

 printf("\n");

 fclose(fp);

 return 0;

}

OUTPUT:

Enter the text press ctrl+z for end of file:

Hello

^Z

Enter the text to append to a file press ctrl+z for end of file:

Welcome

here you learn file concepts.

^Z

File content after appending :

Hello

Welcome

here you learn file concepts.

2. Write a program in C to copy a file in another name.

SOURCE CODE:

#include<stdio.h>

int main() {

 FILE *fp1, *fp2;

 char ch;

 fp1 = fopen("Sample.txt", "w");

 printf("Enter the text press ctrl+z for end of file: \n");

 while ((ch=getchar())!=EOF) {

  putc(ch,fp1);

 }

 fclose(fp1);

 fp1 = fopen("Sample.txt", "r");

 fp2 = fopen("CopiedFile.txt", "w");

    while((ch=fgetc(fp1))!=EOF){

        putc(ch,fp2);

    }

    putc(ch,fp2);

    fclose(fp1);

    fclose(fp2);

    fp2 = fopen("CopiedFile.txt", "r");

    printf("Copied text is : \n");

    while((ch=fgetc(fp2))!=EOF){

        putchar(ch);

    }

    fclose(fp2);

    printf("\n");

    return 0;

}

OUTPUT:

Enter the text press ctrl+z for end of file:

welcome

learn file concepts

^Z

Copied text is :

welcome

learn file concepts

3. Write a program in C to remove a file from the disk.

SOURCE CODE:

#include<stdio.h>

int main() {

 FILE *fp;

 char ch, fileName[30]="Sample.txt";

 int status;

 fp = fopen(fileName, "w");

 printf("Enter the text press ctrl+z for end of file: \n");

 while ((ch=getchar())!=EOF) {

  putc(ch,fp);

 }

 fclose(fp);

    fp = fopen(fileName,"r");

    if(fp==NULL){

        printf("File doesn't exists.\n");

        return 0;

    }

    else{

        printf("File exists.\n");

    }

    fclose(fp);

    status = remove(fileName);

    if(status==0)

        printf("%s file is deleted.",fileName);

    else

        printf("Unable to delete %s file.",fileName);

    return 0;

}

OUTPUT:

Enter the text press ctrl+z for end of file:

hello

^Z

File exists.

Sample.txt file is deleted.

RVS_SOLUTIONS

DS INTERVIEW SITE

Friday, December 6, 2019

First Yr R19 Lab Excecises

EXERCISE-1

EXERCISE-2

EXERCISE-3

EXERCISE-4

EXERCISE-5

EXERCISE-6

EXERCISE-12

EXERCISE-13

EXERCISE-14

EXERCISE-15

EXERCISE-16

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