c语言编写程序确定平年闰年,C语言平年闰年问题

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{

printf("请输入正确日期！/n");

goto aaa;

}

}

int LeapYear(int intoYear,int intoMonth,int intoDay)//闰年计算

{

int today;

switch(intoMonth)

{

case 1:today=0;break;

case 2:today=31;break;

case 3:today=60;break;

case 4:today=91;break;

case 5:today=121;break;

case 6:today=152;break;

case 7:today=182;break;

case 8:today=213;break;

case 9:today=244;break;

case 10:today=274;break;

case 11:today=305;break;

case 12:today=335;break;

default:printf("请输入正确日期");

}

today=today+intoDay;

return today;

}

int CommonYear(int intoYear,int intoMonth,int intoDay)//平年计算

{

int today;

switch(intoMonth)

{

case 1:today=0;break;

case 2:today=31;break;

case 3:today=59;break;

case 4:today=90;break;

case 5:today=120;break;

case 6:today=151;break;

case 7:today=181;break;

case 8:today=212;break;

case 9:today=243;break;

case 10:today=273;break;

case 11:today=304;break;

case 12:today=334;break;

default:printf("请输入正确日期");

}

today=today+intoDay;

return today;

}

上边是我的代码，我加了判断2月份天数不得大于29，可是为什么没有生效呢？请大家帮看一下，谢谢

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