C program to demonstrate call by reference:

void disp(int *,int*,int*,int*);

void main()

{

                int a=2,b=3, sum,mul;

                printf("Enter 1st no:\n");

                scanf("%d",&a);

                printf("Enter 2nd no:\n");

                scanf("%d",&b);

                disp(&a,&b,&sum,&mul);

                printf("\nsum=%d",sum);

                printf("\nMultiplication=%d",mul);

                getch();

}

void disp(int *x,int*y,int *s,int *m)

{

                *s=*x+*y;

                *m=(*x)*(*y);

}

Output: