20 3. Write a program that reads and subtracts two numbers.

#include<stdio.h>
#include<conio.h> 

#include<stdlib.h>
void main ()

{
int *a,*b,*sub;

a=(int*)malloc(sizeof(int));

b=(int*)malloc(sizeof(int));

sub=(int*)malloc(sizeof(int));
clrscr();
printf("a=");

scanf("%d", a);

printf("b=");

scanf("%d", b);

*sum=*a-*b;

printf("The number is %d",*sub);
getch ();
}