java - 输入一个负数且为偶数或正数且为奇数的整数

Question

我正在创建一个程序，要求用户输入几个整数，其中一个语句要求用户“输入一个负偶数或正奇数的整数”。我将如何设置这样的问题？到目前为止我有这个。我不知道我应该怎么做，因为我的指示很困惑。这就是我的问题的问题:

4. 向用户询问一个整数，该整数要么是负数，要么是偶数，要么是正数 和奇怪的。使用 if 语句和复合条件。

import java.util.Scanner;

public class ExerciseFour   
{
public static void main ( String[] argsv )
{


    int choice;
    int choiceTwo;
    int choiceThree;

    Scanner input = new Scanner(System.in);

        System.out.println( "Enter a number between 0 and 10" );
        choice = input.nextInt();


            if ( choice > 0 && choice < 10 ) 
            {   System.out.println( "Valid number" );   
            }
            else 
            {   System.out.println( "Invalid number" );
            return;
            }




        System.out.println( "Enter a number divisible by 2 or 3?" );
        choiceTwo = input.nextInt();

            if ( choiceTwo % 2 == 0 && choiceTwo % 3 == 0 )
            {   System.out.println( "Valid number" );
            }
            else    
            {   System.out.println( "Number not divisible by 2 or 3" );
                return;             
            }

        System.out.println( "Enter an integer that is negative and even or positive and odd (Ex. -2 or 7 )" );
        choiceThree = input.nextInt();

            if ( choiceThree  ) 
            { 
            } 
            else 
            { 
            }

Answer 1

((choiceThree > 0) && (choiceThree % 2 == 1)) || ((choiceThree < 0) && (choiceThree % 2 == 0))

上面是你要找的复合条件，意思是:

(
  (choiceThree > 0)      //positive number / greater than zero
   &&                    // AND
  (choiceThree % 2 == 1) //odd number: (an odd number divided by two has a remainder of 1)
)
||                       // OR
(
 (choiceThree < 0)       //negative number / less than zero
  &&
 (choiceThree % 2 == 0)  //even number (an even number divided by two has a remainder of 0)
)

编辑 % 是 modulo operator .
a % b 的结果是整数除法 a/b 的余数。