例：成績データを表示する

#include <stdio.h>
int main(void) {
int data[ ][5] = { { 82, 98,41, 86,70},
{ 42, 99,92, 69,62},
{ 84, 54,63,100,70}};
int subject, student, sum;
double ave;
for (subject=0; subject<=2; subject++) {
switch (subject) {
case 0: printf("国語\n"); break;
case 1: printf("数学\n"); break;
　　　case 2: printf("英語\n");
}
sum = 0;
for (student=0; student<=4; student++) {
printf("生徒%dの点数は%d点\n",student,data[subject][student]);
sum += data[subject][student];
}
ave = sum / 5.0;
printf("科目平均は%.1f点\n", ave);
}
return 0;
}