Question

Write a complete C program that obtains two integers from the user, saves them in the memory, and calls the function void swap (int *a, int *b) to swap the content of the two integers. The main function of your program should display the two integers before and after swapping.

Answer 1

C program for swapping numbers

#include <stdio.h>

void swap(int *num1, int *num2)/*Defining function  for swapping the numbers*/

{

   int temp; /*using third variable to store data of numbers*/

  temp = *num1;    

  *num1 = *num2;  

  *num2 = temp;      

}

int main ()//driver function

{

  int a,b;

  printf("Enter the numbers for swapping\n");//taking input

  scanf("%d %d",&a,&b);

  printf("The numbers before swapping is a =%d and b=%d \n",a,b);  

  swap(&a, &b);//calling function for swaping  

  printf("The numbers after swapping is a=%d and b=%d",a,b);  

  return 0;      

}

Output

Enter the numbers for swapping  3,4

The numbers before swapping is a =3 and b=4  

The numbers after swapping is a=4 and b=3