用C语言编写这样一个小程序：随便输入二个日期求出其时间段。（哭求）

#include "stdio.h"

void chang(int *a,int *b)
{
int temp;
temp=*a;
*a=*b;
*b=temp;
}

int isR(int year)
{
if(year%4==0&&(year%400==0||year%100!=0)) return 1;
return 0;
}

int check(int *y1,int *m1,int *d1,int *y2,int *m2,int *d2)
{
int mon1[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int mon2[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
if(isR(*y1)) mon1[2] = 29;
if(isR(*y2)) mon2[2] = 29;
if(*m1 <= 0 || *m1 > 12 || *m2 <= 0 || *m2 >12 || *d1 <= 0 || *d1 > 31)
return 0;
if(*d1>mon1[*m1]||*d2>mon2[*m2]) return 0;
if(*y1 > *y2)
{
chang(y1,y2);
chang(m1,m2);
chang(d1,d2);
}
return 1;
}

int TTD(int year,int month,int day)
{
int mon[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int sum=0;
int i=1;
if(month <= 0 || month > 12