#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>

struct person {
    char  first[20];
    char  last[20];
    int   score[2];
    float ratio;
};

struct person p, q;

int main() {
    printf("offset(first)   =%d\n", offsetof(struct person, first));
    printf("offset(last)    =%d\n", offsetof(struct person, last));
    printf("offset(score[0])=%d\n", offsetof(struct person, score[0]));
    printf("offset(score[1])=%d\n", offsetof(struct person, score[1]));
    printf("offset(ratio)   =%d\n", offsetof(struct person, ratio));
    printf("total           =%d\n", (void*)&q - (void*)&p);
}