代码如下:
#include <stdio.h>#define MONTHS 12int main(){int days[MONTHS] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };int month;do {printf("Input a month:");scanf_s("%d", &month);} while (month < 1 || month>12);printf("The number of days is %d\n", days[month - 1]);return 0;}