C言語 構造体

#include <stdio.h>
#define KOKUGO 0
#define SUUGAKU 1
#define EIGO 2
#define HEIKIN 3
int main()
{
float a[4];
a[KOKUGO] = 50;
a[SUUGAKU] = 70;
a[EIGO] = 80;
a[HEIKIN] = (a[KOKUGO]
+ a[SUUGAKU] + a[EIGO]) / 3.0;
printf("国語の得点: %3.0f\n", a[KOKUGO]);
printf("数学の得点: %3.0f\n", a[SUUGAKU]);
printf("英語の得点: %3.0f\n", a[EIGO]);
printf("平均点: %5.1f\n", a[HEIKIN]);
}