#include <stdio.h>
void swap_by_value(int*num1,int*num2)
{
    int temp;
    temp=*num1;
    *num1=*num2;
    *num2=temp;
    temp=*num1;
    *num1=*num2;
    *num2=temp;
}
int main()
{
    int a,b;
    a=7,b=11;
    printf("before swapping\n\n");
    printf("a=%d\t b=%d\n",a,b);
    printf("\n\n after swapping\n\n");
    swap_by_value(&a,&b);
    printf("a=%d\t b=%d\n",b,a);
    return 0;
}