儘管C語言提供了許多低階處理的功能，但仍然保持著良好跨平臺的特性，以一個標準規格寫出的C語言程式可在許多電腦平臺上進行編譯，甚至包含一些嵌入式處理器(微控制器或稱MCU)以及超級電腦等作業平臺。下面是小編為大家搜尋整理的`C語言判斷兩個日期只差的方法，希望能給大家帶來幫助!更多精彩內容請及時關注我們應屆畢業生考試網!
1.普通的寫法
複製程式碼 程式碼如下:
#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 < 0)?(-diff):diff;
}
else
{
if(day1[1] < day2[1]) //day1=1991-5-8 day2=1991-6-2
{
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="">2)
if(leapyear(day2[0]))
diff++;
}
}
else
{
if(day1[0] < day2[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<=12; i++) //day1=1992-1-1 day2=1991-1-1
{
diff += month[i];
}
diff += (month[day2[1]] - day2[2]);
if(day2[1] <= 2)
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("輸入日期：");
scanf("%d-%d-%d",&day1[0], &day1[1], &day1[2]);
printf("輸入另一個日期：");
scanf("%d-%d-%d",&day2[0], &day2[1], &day2[2]);
day = days(day1, day2);
printf("兩個日期之間共有%d天。n",day);
return 0;
}
2.利用結構體，程式碼更整潔一些
複製程式碼 程式碼如下:
#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) //如果第一個日期比第二個日期大，交換日期
{
DATE *tmp;
if(d1->year == d2->year) //年數相等
{
if(d1->month > d2->month) //月數相等
{
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; imonth; i++)
{
diff += month[i];
}
diff += month[date1->month] - date1->day + date2->day;
if(leapyear(date1->year))
if(date1->month <=2 date2-="">month >2)
diff++;
}
}
else
{
for(i=date1->year+1; iyear; i++)
{
if(leapyear(i))
diff += 366;
else
diff += 365;
}
for(i=date1->month+1; i<=12; i++) //date1距離年末多少天
{
diff += month[i];
}
diff += month[date1->month] - date1->day;
if(date1->month <= 2)
if(leapyear(date1->year))
diff++;
for(i=1; imonth; i++) //date2距離年初多少天
{
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("輸入日期：");
scanf("%d-%d-%d",&(date1->year), &(date1->month), &(date1->day));
printf("輸入另一個日期：");
scanf("%d-%d-%d",&date2->year, &date2->month, &date2->day);
compare(date1, date2);
days = diff(date1, date2);
printf("兩個日期之間共有%d天。n",days);
return 0;
}
