能不能帮我编个nextdata函数
最好能根据一下等价类编
M1={月份：每月有30天}
M1={月份：每月有31天}
M1={月份：此月是2月}
D1={日期：1《日期《28}
D2={日期：日期=29}
D3={日期：日期=30}
D3={日期：日期=31}
Y1={年：年是闰年}
Y1={年：年不是闰年}

[解决办法]
#include <stdio.h>
#include <stdlib.h>

int main()
{
int y,m,d;
int f, fwrong=0;

printf( "y,m,d= ");
scanf( "%d%d%d ",&y,&m,&d); /*输入格式： 1996 2 28， 空格分割数据*/

f= ( (y%4==0) && (y%100!=0) ) || (y%400==0);
switch(m)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
if(d <31)d++;
else if(d == 31)
{
if(m != 12){m++; d=1;}
else {y++; m=1; d=1;}
}
else {fwrong=1; printf( "The date is wrong!!\n ");}
break;

case 4:
case 6:
case 9:
case 11:
if(d <30)d++;
else if(d == 30){m++; d=1;}
else {fwrong=1; printf( "The date is wrong!!\n ");}
break;

case 2:
if(f)
{
if(d <28)d++;
else if(d == 28){m++; d=1;}
else {fwrong=1; printf( "The date is wrong!!\n ");}
break;
}
else
{
if(d <29)d++;
else if(d == 29){m++; d=1;}
else {fwrong=1; printf( "The date is wrong!!\n ");}
break;
}
}
if(!fwrong)
printf( "The date of next day is %d,%d,%d ", y, m, d);
system( "PAUSE ");
return 0;
}