闰年 - 主要设置错误

Question

错误：重复本地变量yearb 我被要求把月，年，日3个单独的变量。

您将这些值发送到convertdays方法，该方法将使用以下公式以一个长整数的形式返回日期：您的长年将是年份的总和乘以10000，月份乘以100，以及那天。这是一个用于将日期放在可以排序的表单中的公式（我们不会对日期进行排序，只是将其放入可以排序的表单中）。回到主页，你将打印这个标记的长整数。

/* rayane seridj
 * 5-10
 * */
import java.util.Scanner;
public class hw2222
  
{
  public static void main (String [] args)
  {
 int month, day, year,dates,yearb;
    Scanner input = new Scanner(System.in);
    System.out.print("Please Enter Date in The Format mm/dd/yyyy : ");
    month = input.nextInt();
    day = input.nextInt();
    year = input.nextInt();
    
boolean yearb;
yearb = leap(year);
if (yearb == true)
System.out.println (year + " is a leap year ");  
    else 
    System.out.println (year + " is not a leap year");

  }
  
   public static int convertdays (int month ,int day, int year)
  {
    int yy,dd,mm,dates;
    yy =10000 *year;
    mm = 100 *month;
    dd= day;
    dates =yy + mm +dd;
    return dates;
   }

  public static boolean leap(int year)
  {
    if (year % 400 == 0 || (year % 4 ==0 && year %100 !=0))
  return true;
  else 
    return false;
    }
}

Answer 1

您声明变量yearb两次：

• at int month, day, year,dates,yearb;
• at boolean yearb;

变量只能在特定的上下文中声明一次（方法，全局等）。

尝试下面的代码（注意一个名为isLeap的新变量）：

＆＃13;

＆＃13;

/* rayane seridj
 * 5-10
 * */
import java.util.Scanner;
public class hw2222
  
{
  public static void main (String [] args)
  {
    int month, day, year,dates,yearb;
    Scanner input = new Scanner(System.in);
    System.out.print("Please Enter Date in The Format mm/dd/yyyy : ");
    month = input.nextInt();
    day = input.nextInt();
    year = input.nextInt();
    
    boolean isLeap;
    isLeap = leap(year);
    if (isLeap)
        System.out.println (year + " is a leap year ");  
    else 
        System.out.println (year + " is not a leap year");

  }
  
   public static int convertdays (int month ,int day, int year)
  {
    int yy,dd,mm,dates;
    yy =10000 *year;
    mm = 100 *month;
    dd= day;
    dates =yy + mm +dd;
    return dates;
   }

  public static boolean leap(int year)
  {
    if (year % 400 == 0 || (year % 4 ==0 && year %100 !=0))
        return true;
    else 
        return false;
    }
}

＆＃13;

＆＃13;

＆＃13;