C语言中怎样判断两个日期之差
来源：爱站网时间：2018-10-30编辑：网友分享
C语言中怎样判断两个日期之差？输入两个日期，计算之间相差多少天。 用了两种方法实现，第二种利用结构体，代码比较清晰，其余的都一样，下面来一起看看吧。
C语言中怎样判断两个日期之差？输入两个日期，计算之间相差多少天。 用了两种方法实现，第二种利用结构体，代码比较清晰，其余的都一样，下面来一起看看吧。
1.普通的写法
#include
int leapyear(int year)
{
if((year%4==0 && year%100!=0) || year%400==0)
return 1;
else
return 0;
}
int days(int *day1, int *day2)
{
int i=0;
int *tmp;
int diff = 0;
const int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
if(day1[0] == day2[0])
{
if(day1[1] == day2[1])
{
diff = day1[2] - day2[2];
diff = (diff }
else
{
if(day1[1] {
tmp = day1; //day1=1991-6-2 day2=1991-5-8
day1 = day2;
day2 = tmp;
}
for(i=day2[1]+1; i
diff += month[i];
}
diff += month[day2[1]] - day2[2] + day1[2];
if(day2[1] 2)
if(leapyear(day2[0]))
diff++;
}
}
else
{
if(day1[0] {
tmp = day1;
day1 = day2;
day2 = tmp;
}
for(i=day2[0]+1; i
if(leapyear(i))
diff += 366;
else
diff += 365;
}
for(i=day2[1]+1; i {
diff += month[i];
}
diff += (month[day2[1]] - day2[2]);
if(day2[1] if(leapyear(day2[0]))
diff++;
for(i=1; i
diff += month[i];
}
diff += day1[2];
if(day1[1] > 2)
if(leapyear(day1[0]))
diff++;
}
return diff;
}
int main()
{
int day1[3], day2[3];
int day = 0;
printf("输入日期：");
scanf("%d-%d-%d",&day1[0], &day1[1], &day1[2]);
printf("输入另一个日期：");
scanf("%d-%d-%d",&day2[0], &day2[1], &day2[2]);
day = days(day1, day2);
printf("两个日期之间共有%d天。\n",day);
return 0;
}
2.利用结构体，代码更整洁一些
#include
typedef struct date
{
int year;
int month;
int day;
}DATE;
int leapyear(int year)
{
if((year%4==0 && year%100!=0) || year%400==0)
return 1;
else
return 0;
}
int compare(DATE *d1, DATE *d2) //如果第一个日期比第二个日期大，交换日期
{
DATE *tmp;
if(d1->year == d2->year) //年数相等
{
if(d1->month > d2->month) //月数相等
{
tmp = d1;
d1 = d2;
d2 = d1;
}
else if(d1->month == d2->month) //日期相等
{
if(d1->day > d2->day)
{
tmp = d1;
d1 = d2;
d2 = d1;
}
}
}
else if(d1->year > d2->year)
{
tmp = d1;
d1 = d2;
d2 = tmp;
}
return 0;
}
int diff(DATE *date1, DATE *date2)
{
int i;
int diff = 0;
const int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
if(date1->year == date2->year)
{
if(date1->month == date2->month)
{
diff = date2->day - date1->day;
}
else
{
for(i=date1->month+1; i
{
diff += month[i];
}
diff += month[date1->month] - date1->day + date2->day;
if(leapyear(date1->year))
if(date1->month month >2)
diff++;
}
}
else
{
for(i=date1->year+1; i
{
if(leapyear(i))
diff += 366;
else
diff += 365;
}
for(i=date1->month+1; i {
diff += month[i];
}
diff += month[date1->month] - date1->day;
if(date1->month if(leapyear(date1->year))
diff++;
for(i=1; i
{
diff += month[i];
}
diff += date2->day;
if(date1->month > 2)
if(leapyear(date2->year))
diff++;
}
return diff;
}
int main()
{
int days = 0;
DATE day1, day2;
DATE *date1, *date2;
date1 = &day1;
date2 = &day2;
printf("输入日期：");
scanf("%d-%d-%d",&(date1->year), &(date1->month), &(date1->day));
printf("输入另一个日期：");
scanf("%d-%d-%d",&date2->year, &date2->month, &date2->day);
compare(date1, date2);
days = diff(date1, date2);
printf("两个日期之间共有%d天。\n",days);
return 0;
}
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