14. Write a program to differentiate call by value and call by reference.

    #include <stdio.h>
    #include <conio.h>
    void swapref(int *x, int *y)
    {
        int temp;
        temp = *x;
        *x = *y;
        *y = temp;
    }
    void swapval(int x, int y)
    {
        int temp;
        temp = x;
        x = y;
        y = temp;
    }
    void main()
    {
        int a = 5, b = 2;
        clrscr();
        printf("Before calling swapval function a=%d,b=%d", a, b);
        swapval(a, b);
        printf("\nAfter calling swapval function a=%d, b=%d", a, b);
        printf("\nBefore calling swapref function a=%d,b=%d", a, b);
        swapref(&a, &b);
        printf("\nAfter calling swapref function a=%d, b=%d", a, b);
    }