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Question

我最终完成了我的直方图程序，并希望获得最后润色的帮助，我需要我的程序拒绝非数值添加，然后显示一个说重试或其他东西的println。到目前为止，我已经想出了这个，但我不确定我是否将循环放在正确的位置？

package hcw;

import java.util.Scanner;

public class HCW {

public static void main(String[] args) {

    Scanner MK = new Scanner(System.in);

    int marks = 0, count, count2, count3, count4 = 0;
    int Range = 0, Range2 = 0, Range3 = 0, Range4 = 0;
    int totalmarks = 0;
    do {
        System.out.println("Enter mark: ");
        marks = MK.nextInt();
        while (marks != marks);

        int biggestmark = 0;
        int smallestmark = 100;

        while ((marks < 101) && (marks >= 0)) {
            if (marks <= 29) {
                Range++;
            } else if ((marks <= 39) && (marks >= 30)) {
                Range2++;
            } else if ((marks <= 69) && (marks >= 40)) {
                Range3++;
            } else if ((marks <= 70) && (marks >= 101)) {
                Range4++;
            }
            totalmarks = totalmarks + marks;
            if (marks > biggestmark) {
                biggestmark = marks;
            }
            if (marks < smallestmark) {
                smallestmark = marks;
            }

            System.out.println("Enter mark:   ");
            marks = MK.nextInt();

        }

        System.out.println("0 - 29         ");
        for (count = 0; count < Range; count++) {

            System.out.print("*");// if you want * vertically add ln to print
        }
        System.out.println("");

        System.out.println("30 - 39        ");
        for (count2 = 0; count2 < Range2; count2++) {

            System.out.print("*");// if you want * vertically add ln to print
        }

        System.out.println("");

        System.out.println("40 - 69        ");
        for (count3 = 0; count3 < Range3; count3++) {

            System.out.print("*");// if you want * vertically add ln to print
        }

        System.out.println("");

        System.out.println("70 - 100        ");
        for (count4 = 0; count4 < Range3; count4++) {

            System.out.print("*");// if you want * vertically add ln to print
        }

        System.out.println("");
        System.out.println("");

        int totalstudents = count + count2 + count3 + count4;
        int averagemark = totalmarks / totalstudents;
        int studentpass = count3 + count4;

        System.out.println("Students in total are " + totalstudents);
        System.out.println("Average Mark is " + averagemark);
        System.out.println("Number of Students who passed (with a mark over 40) is " + studentpass);
        System.out.println("Highest Mark Awarded is " + biggestmark);
        System.out.println("Smallest Mark Awarded is " + smallestmark);
        System.out.println(totalstudents + smallestmark);

        {
            System.out.println("0 - 29         ");
            for (count = 0; count < Range; count++) {

                System.out.println("*");// if you want * vertically add ln to print
            }
            System.out.println("");

            System.out.println("30 - 39        ");
            for (count2 = 0; count2 < Range2; count2++) {

                System.out.println("*");// if you want * vertically add ln to print
            }

            System.out.println("");

            System.out.println("40 - 69        ");
            for (count3 = 0; count3 < Range3; count3++) {

                System.out.println("*");// if you want * vertically add ln to print
            }

            System.out.println("");

            System.out.println("70 - 100        ");
            for (count4 = 0; count4 < Range3; count4++) {

                System.out.println("*");// if you want * vertically add ln to print
            }

            System.out.println("");
            System.out.println("");
        }

        System.out.println("");

        System.out.println("");

    }

}

非常感谢。

Answer 1

您应首先修复终止String或int，因为在某些输入后您想要停止。 为此，您可以首先获取整数学生的整数值，然后循环这些值。 或者你可以获取字符串值，如果没有终止，可以从字符串解析到int  一个字符串。 例如。输入标记： -

1 2 3 做完了。完成是终止字符串。

对于非数字值，您可以添加try-catch块，在那里打印消息，然后再返回到同一点。