本文带来各类奇怪的IT百科知识。
从键盘输入某年某月：包括闰年：：用switch语句编程输出该年的改月拥有的天数。要求考虑闰年以及输入月份不在合法范围内的情况。已知闰年的2月有29天：平年有28天。
#include ：stdio.h：
int main() {
int year,month;
scanf(：%d %d：,：year,：month);
printf(：Please enter year and month ：);
if((year%4：：0 ：： year%100!：0 ) || year%400：：0 ){ //判断是否是闰年
switch (month) {
case 2: 29;
printf(：There are 29 days in this month：);
break;
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
printf(：There are 31 days in this month：);
break;
case 4:
case 6:
case 9:
case 11:
printf(：There are 30 days in this month：);
break;
}
} else{
switch (month) {
case 2: 28;
printf(：There are 28 days in this month：);
break;
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
printf(：There are 31 days in this month：);
break;
case 4:
case 6:
case 9:
case 11:
printf(：There are 30 days in this month：);
break;
}
}
return 0;
}
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