size of in c

#include<stdio.h>

int main(){
int num = 20;
printf("Size of: %ld\n",sizeof(num));
printf("Size of int: %ld\n",sizeof(int));
printf("Size of double: %ld\n",sizeof(double));
printf("Size of float: %ld\n",sizeof(float));
printf("Size of char: %ld\n",sizeof(char));

    return 0;
}