分别用C++和Java写的计算后天的日期code

#include<iostream>#include<cstdio>#include<cstring>using namespace std;bool checkNum(char c){if(c >='0' && c <='9')return true;return false;}bool checkString(string str){if(checkNum(str[0])&&checkNum(str[1])&&checkNum(str[2])   &&checkNum(str[3])&&(str[4]=='-')&&checkNum(str[5])   &&checkNum(str[6])&&(str[7]=='-')&&checkNum(str[8])&&checkNum(str[9]))return true;return false;}int main(){string str;int year;int month;int day;while(cin>>str){   int flag = 1;   if(!checkString(str)){     flag=0;   cout<<"您输入的日期格式不符合要求"<<endl<<endl;  }else{year=(str[0]-'0')*1000+(str[1]-'0')*100+(str[2]-'0')*10+(str[3]-'0');month=(str[5]-'0')*10+(str[6]-'0');day=(str[8]-'0')*10+(str[9]-'0');if(month==1 || month==3 || month==5 || month==7     || month==8 || month==10 || month==12){if(day >=1 && day <=31){day += 2;if(day > 31){month += 1;day = 1;}if(month > 12){year += 1;month = 1;}}else{flag=0;cout<<"您输入的日期不存在"<<endl<<endl;}}else if(month==4 || month==6 || month==9 || month==11){if(day >=1 && day <=30){day += 2;if(day > 30){month += 1;day = 1;}if(month > 12){year += 1;month = 1;}}else{flag=0;cout<<"您输入的日期不存在"<<endl<<endl;}}else if(month == 2){if((year%4==0 && year%100!=0) || (year%400==0)){  //如果为闰年 if(day >=1 && day <=29){day += 2;if(day > 29){month += 1;day = 1;}if(month > 12){year += 1;month = 1;}}else{   flag=0;   cout<<"您输入的日期不存在"<<endl<<endl;    }}else{if(day >=1 && day <=28){day += 2;if(day > 28){month += 1;day = 1;}if(month > 12){year += 1;month = 1;}}else{   flag=0;   cout<<"您输入的日期不存在"<<endl<<endl;    }}}else{cout<<"您输入的月份不存在"<<endl<<endl;}  }  if(flag==1){  cout<<"后天的日期为： "<<year<<"年"<<month<<"月"<<day<<"日"<<endl<<endl;  }}return 0;}

import java.util.Scanner;public class CalculateTheDayAfterTomorrow {public static boolean checkNum(char c) {// 判断当前字符是否为数字if (c >= '0' && c <= '9')return true;return false;}public static boolean checkString(String str) {// 判断字符串是否为指定的日期格式：yyyy-mm-ddif (checkNum(str.charAt(0)) && checkNum(str.charAt(1))&& checkNum(str.charAt(2)) && checkNum(str.charAt(3))&& (str.charAt(4) == '-') && checkNum(str.charAt(5))&& checkNum(str.charAt(6)) && (str.charAt(7) == '-')&& checkNum(str.charAt(8)) && checkNum(str.charAt(9)))return true;return false;}public static void main(String args[]) {String str;int year = 0;int month = 0;int day = 0;Scanner scanner = new Scanner(System.in);while ((str = scanner.nextLine()) != null) {int flag = 1;if (!checkString(str)) {flag = 0;System.out.println("您输入的日期格式不符合要求" + "\n");} else {// 计算年月日year = (str.charAt(0) - '0') * 1000 + (str.charAt(1) - '0')* 100 + (str.charAt(2) - '0') * 10+ (str.charAt(3) - '0');month = (str.charAt(5) - '0') * 10 + (str.charAt(6) - '0');day = (str.charAt(8) - '0') * 10 + (str.charAt(9) - '0');// 每个月的天数不一样，分类讨论if (month == 1 || month == 3 || month == 5 || month == 7|| month == 8 || month == 10 || month == 12) {if (day >= 1 && day <= 31) {day += 2;if (day > 31) { // 已经跨月了month += 1;day -= 31;}if (month > 12) { // 后两天跨年了year += 1;month = 1;}} else {flag = 0;System.out.println("您输入的日期不存在" + "\n");}} else if (month == 4 || month == 6 || month == 9|| month == 11) {if (day >= 1 && day <= 30) {day += 2;if (day > 30) {month += 1;day -= 30;}if (month > 12) {year += 1;month = 1;}} else {flag = 0;System.out.println("您输入的日期不存在" + "\n");}} else if (month == 2) {if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {// 如果为闰年if (day >= 1 && day <= 29) {day += 2;if (day > 29) {month += 1;day -= 29;}if (month > 12) {year += 1;month = 1;}} else {flag = 0;System.out.println("您输入的日期不存在" + "\n");}} else {// 平年if (day >= 1 && day <= 28) {day += 2;if (day > 28) {month += 1;day -= 28;}if (month > 12) {year += 1;month = 1;}} else {flag = 0;System.out.println("您输入的日期不存在" + "\n");}}} else {flag = 0;System.out.println("您输入的月份不存在" + "\n");}}if (flag == 1) { // 通过flag标志输入的日期是否合法System.out.println("后天的日期为： " + year + "年" + month + "月" + day+ "日" + "\n");}}}}

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