basic1.c

#include<stdio.h>
int main()
{
    int x = 10; //initilize
    int y = 20;
    int sum = x + y;
    int mul = x * y;
    int div = y / x;
    int diff = y - x;
    printf("x + y = %d\n", sum);
    printf("x * y = %d\n", mul);
    printf("y / x = %d\n", div);
    printf("y - x = %d\n", diff);
}