源程序如下：
#include "pch.h"
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;
int main()
{
int s[2][13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31,
0,31,29,31,30,31,30,31,31,30,31,30,31, };
int year = 0;
int month = 0;
int day = 0;
int n, i, daytemp;
int flag = 0;
int nyear = 0, nmonth = 0, nday = 0;
printf("输入年月日\n");
scanf("%d%d%d", &year, &month, &day);
//printf("输入天数\n");
//scanf("%d",&n);
n = 1;
if (year < 0 || month < 0 || month>12 || day < 1 || n < 0)
{
printf("输入数据错误\n");
return 1;
}
daytemp = day + n;//累加天数
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)//闰年置1
flag = 1;
if (day > s[flag][month])
{
printf("输入日期与年月不符.\n");
return 1;
}
if (daytemp <= s[flag][month])//当前日期加天数在本月
{
nyear = year;
nmonth = month;
nday = daytemp;
}
else
{
i = month;
nyear = year；
while (daytemp > s[flag][i])//循环递减，直到当前日期加天数在本月
{
daytemp = daytemp - s[flag][i];
i++;
if (i > 12)//超过一年，年累加
{
nyear++;
if ((nyear % 4 == 0 && nyear % 100 != 0) || nyear % 400 == 0)
flag = 1;
else
flag = 0;
i = i - 12;
}
}
nmonth = i;
nday = daytemp;
}
printf("%d年%d月%d日第%d天后是:\n", year, month, day, n);
printf("%d年%d月%d日\n", nyear, nmonth, nday);
return 0;
}
程序运行结果如下：
扩展资料：
其他实现方式：
int monthsize(int year, int month) {
int days;
if (month == 2) {
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
return 29;
return 28;
}
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:days = 31; break;
case 4:
case 6:
case 9:
case 11: days = 30; break;
}
return days;
}
int main()
int year, month, day, days;
printf("年 月 日:");
while (scanf("%d%d%d", &year, &month, &day) == 3) {
days = monthsize(year, month);
if (days == day) {
if (month == 12) {
++year;
month = 1;
day = 1;
}
else ++month;
}
else ++day;
printf("第二天是:%d/%02d/%02d\n", year, month, day);
printf("年 月 日(q to quit):");
}
return 0;
}