为什么呢？

Question

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

Answer 1

最后printf那里，应该是 days[month-1] 吧。  你写成days[MONTH-1]，岂不是每次都打印31.