某年某月有多少天c语言程序,判断某年某月有多少天（C语言）

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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;

}