C Program to Swap the values of two variables using function.

    In this example, we swap the values of two variables using function. We have declared a function swap.

PROGRAM

#include<stdio.h>

#include<conio.h>

void swap(int*,int *);

int main()

{

    int a,b;

    printf("Enter the values of a and b : ");

    scanf("%d%d",&a,&b);

    printf("Before swapping the values in main a=%d , b=%d\n",a,b);

    swap(&a,&b);

    printf("After swapping the values in main a=%d , b=%d\n",a,b);

    getch();

}

void swap(int *a,int *b)

{

    int temp;

    temp=*a;

    *a=*b;

    *b=temp;

    printf("After swapping values in function a=%d, b=%d\n",*a,*b);

}

OUTPUT

 Enter the values of a and b : 10

 20

 Before swapping the values in main a=10 , b=20

 After swapping values in function a=20, b=10  

 After swapping the values in main a=20 , b=10  

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