call by value

CALL  BY VALUE:

void swap(int a,int b)

{

int t;

t=a;

a=b;b=t;

}

void main()

{

    int a=10,b=20;

    printf("Before swapping : %d,%d\n",a,b);

    swap(a,b);

    printf("After swapping : %d,%d\n",a,b);

}

OUTPUT

Before swapping : 10,20

After swapping :10,20

Explanation :the a,b in main() and swap() functions are different....

So the changes made to a and b in the swap() function has no affect on a and b of main().