java - 条件和循环练习

Question

我坚持做一个练习，它说“编写一个程序，确定并打印从键盘读取的整数值中的奇数、偶数和零位数。我做错了什么以及如何纠正我的错误？”错误？

import java.util.Scanner;

public class OddEven {
   public static void main(String[] args){
   Scanner scan = new Scanner(System.in);

   int odd=0;
   int even=0;
   int zero=0;
   int num=0;
   int value;

   System.out.println("Enter a value: ");
   value=scan.nextInt();
   if (value%2==0)
       even=even+1;
   else
       odd=odd+1;
   System.out.println("even = "+ even);
   System.out.println("odd = "+odd);
   System.out.println("zero = "+zero);
   }
}

Answer 1

您必须一次检查每个数字:

int odd, even, zero, value;
value = scan.nextInt();

while(value > 0) {
    int digit = value%10; //isolates only the last digit
    if(digit==0)zero++;
    else if(digit%2==0)even++;
    else odd++;
    value /= 10; //removes the last digit
}