求一可求两日期差的C++程序

#include<stdio.h>

struct date{
unsigned int year;
unsigned short month;
unsigned short day;
};

inline int isleap(unsigned int year)
{
return ((year%4==0&&year%100!=0)||(year%400==0));
}

int diffdate(struct date begin,struct date end)
{
int days;
int months,years;

int tmpyear,tmpmonth,leapyear;

short monthday[2][12]={
{31,28,31,30,31,30,31,30,31,30,31},
{31,29,31,30,31,30,31,30,31,30,31}
};

if(isleap(end.year)){
leapyear =1;
}else{
leapyear = 0;
}

years = end.year - begin.year;
months = end.month - begin.month;
days = end.day - begin.day;

tmpyear = begin.year;
while(years>0){
if(isleap(tmpyear))
days+=366;
else
days+=365;