Adding and Subtraction of Numbers.

#include<stdio.h>
#include<conio.h>

void main()
{
clrscr();
int a,b,c,d;
a=11;
b=10;
c=a+b;
d=a-b;
printf("\n the sum of a and b is %d",c);
printf("\n the difference of a and b is %d",d);
getch();
}