Size of Datatype

#include<stdio.h>
int main()
{
    int i;
    float j;
    double k;
    char a;

    printf("Size of integer : %d bytes\n", sizeof(i));

    printf("Size of float : %d bytes\n", sizeof(j));

    printf("Size of double : %d bytes\n", sizeof(k));

    printf("Size of char : %d byte\n", sizeof(a));

    return 0;
}