最大和出现次数

Question

In my lab, we have to have the user input numbers, until they enter '0'. The program will then find the max, count the number of occurrences, and output both numbers.

Here's my code:

  Scanner scan = new Scanner(System.in);

  int max = Integer.MIN_VALUE, count = 0, num;

  System.out.println ("Enter a number (Enter a 0 to stop): ");
     num = scan.nextInt();

  while (num != 0){
     System.out.println ("Enter a number: ");
     num = scan.nextInt();
     if (num >= max){
        max = num;
        count ++;
     }
  }
     System.out.println("\nMax number was: " + max);
     System.out.println("Number of occurrences: " + count);

Now when it outputs, sometimes I get the right answer and sometimes not. I figure I just have the loop wrong or maybe the counter needs to be reset, but I can't figure it out.

For example:

If I enter: 3, 5, 2, 5, 5, 5, 0

The output reads: Max number was: 5 Number of occurrences: 4

But if I enter: 3, 5, 9, 2, 5, 9, 0

The output reads: Max number was: 9 Number of occurrences: 3

Just looking for some advice.

Answer 1

If num > max , then it's the first occurrence of the max, and count should be set to 1. If num == max , then it's another occurrence of the max, and count should be incremented.

Also, as @doelleri correctly mentions in a comment, the first number is ignored.

Answer 2

The best loop to use here is the do...while

Here is a correction to your code :

You'll have to reset the count variable only if a new max is found.

          do{
             System.out.println ("Enter a number: ");
             num = scan.nextInt();
             if (num > max){
                max = num;
                count = 1;
             } else if (num == max){
                 count++;
             }
          }while (num != 0);

          System.out.println("\nMax number was: " + max);
          System.out.println("Number of occurences: " + count);

Answer 3

找到新的最大值后，您需要重置计数变量。

Answer 4

You need to reset the counter when ever you observe a new max value. Also you should use do-while instead of a while loop. Because do-while loop always executes once, so you can take the user input in the loop.

    Scanner scan = new Scanner(System.in);
    int max = Integer.MIN_VALUE, count = 0, num;
    System.out.println ("Enter a number (Enter a 0 to stop): ");
    do {
      System.out.println ("Enter a number: ");
      num = scan.nextInt();
      if (num >= max){
        count = num == max ? count+1 : 1;
        max = num;
      }
    }while(num != 0);
    System.out.println("\nMax number was: " + max);
    System.out.println("Number of occurences: " + count);