example of sizeof operator

#include<stdio.h>
struct jd{
  int x;
  double y;
  int z;
}s1;
int main()
{
 int a=5,b=5;
 printf("%d\n", sizeof(int));
 printf("%d\n", sizeof(char));
 printf("%d\n", sizeof(double));
 printf("%d\n", sizeof(long));
 printf("%d\n", sizeof(a));
 printf("%d\n", sizeof(a+b));
 printf("%d", sizeof(s1));
 return 0;
}

output:

4
1
8
4
4
4
16