可以计算天数的一个小程序。大家可以去计算每月的是哪一天

田建

import java.util.*;

class Test4
{
public static void main(String[] args)
{
Scanner can =new Scanner(System.in);
System.out.print("请输入年份");
int a=can.nextInt();
if (a<0)
{
System.out.println("你输入的年份不在电脑的计算之中");
System.out.println("请重新输入年份");
a=can.nextInt();

}
System.out.print("请输入月份");
int b=can.nextInt();
if (b<0 || b>12)
{
System.out.println(b+"月份不存在");
   System.out.print("请重新输入");
   b=can.nextInt();
}
System.out.print("请输入日子");
int c=can.nextInt();
if (c<0 || c>31)
{
System.out.println("该月不存在"+c+"天");
   System.out.println("请重新输入");
c=can.nextInt();
}
if (a%4==0 && a%100!=0 && a%400==0)
{
System.out.println("你所输入的"+a+"年为润年");
System.out.println("该年有365天");
if (b==1)
{
System.out.println("第"+c+"天");
}
else if (b==2)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==3)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==4)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==5)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==6)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==7)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==8)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==9)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==10)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==11)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
}
else if (b==1)
{
System.out.println("第"+c+"天");
}
else if (b==2)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==3)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==4)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==5)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==6)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==7)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==8)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==9)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==10)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==11)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else
{
System.out.println("第"+((b-1)*30+c)+"天");
}

}
}

import java.util.*;
class Test4
{
public static void main(String[] args)
{
Scanner can =new Scanner(System.in);
System.out.print("请输入年份");
int a=can.nextInt();
if (a<0)
{
System.out.println("你输入的年份不在电脑的计算之中");
System.out.println("请重新输入年份");
a=can.nextInt();
}
System.out.print("请输入月份");
int b=can.nextInt();
if (b<0 || b>12)
{
System.out.println(b+"月份不存在");
System.out.print("请重新输入");
b=can.nextInt();
}
System.out.print("请输入日子");
int c=can.nextInt();
if (c<0 || c>31)
{
System.out.println("该月不存在"+c+"天");
System.out.println("请重新输入");
c=can.nextInt();
}
if (a%4==0 && a%100!=0 && a%400==0)
{
System.out.println("你所输入的"+a+"年为润年");
System.out.println("该年有365天");
if (b==1)
{
System.out.println("第"+c+"天");
}
else if (b==2)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==3)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==4)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==5)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==6)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==7)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==8)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==9)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==10)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else if (b==11)
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
else
{
System.out.println("第"+((b-2)*30+29+c)+"天");
}
}
else if (b==1)
{
System.out.println("第"+c+"天");
}
else if (b==2)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==3)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==4)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==5)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==6)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==7)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==8)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==9)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==10)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else if (b==11)
{
System.out.println("第"+((b-1)*30+c)+"天");
}
else
{
System.out.println("第"+((b-1)*30+c)+"天");
}
}
}

复制代码

黑马-李勇 · 黑马-李勇

用switch case会不会好看点？if多了有点晕.

柏占肖 · 柏占肖

import java.util.Scanner;
public class GetDays {
public static void main(String[] args) {
int[] months = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int year, month, day, days = 0;
Scanner scanner = new Scanner(System.in);
while (true) {
System.out.print("请输入年份");
year = scanner.nextInt();
if (1 <= year) {
break;
}
System.out.println("输入无效");
}
while (true) {
System.out.print("请输入月份");
month = scanner.nextInt();
if (1 <= month & 12 >= month) {
break;
}
System.out.println("输入无效");
}
while (true) {
System.out.print("请输入日子");
day = scanner.nextInt();
if (2 == month) {
if (1 > day ? false : isRunNian(year) ? 29 >= day : 28 >= day) {
break;
}
} else if (1 <= day & day <= months[month]) {
break;
}
System.out.println("输入无效");
}
scanner.close();
for (int i = 1; i < month; i++) {
days += months[i];
}
days += day;
if (isRunNian(year) & 2 < month) {
days++;
}
System.out.println("第" + days + "天");
}
public static boolean isRunNian(int year) {
return year % 100 == 0 ? year % 400 == 0 : year % 4 == 0;
}
}

复制代码

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可以计算天数的一个小程序。大家可以去计算每月的是哪一天

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