Program Of Call By Address Using c

#include<stdio.h>

#include<conio.h>

int sum(int *a,int *b);

main()

{

int x,y,z;

clrscr();

printf("ENter First NUmber=");

scanf("%d",&x);

printf("ENter Second NUmber=");

scanf("%d",&y);

z=sum(&x,&y);

printf("\n Answer=%d",z);

getch();

}

int sum(int *a,int *b)

{

int c;

c= *a + *b;

return c;

}