Question

所以我需要在每一行中摆脱这个最终的乘法符号。我尝试了几种不同的方式，但他们只是弄乱了我的代码或者没有工作，而我似乎无法解决这个问题。

以下是输出示例：

Starting value (at least 2): 
59

Ending value (at least 2): 
64

59 = 59 x 

60 = 2 x 2 x 3 x 5 x 

61 = 61 x 

62 = 2 x 31 x 

63 = 3 x 3 x 7 x 

64 = 2 x 2 x 2 x 2 x 2 x 2 x

以下是我希望它的外观：

Starting value (at least 2): 
59

Ending value (at least 2): 
64

59 = 59 

60 = 2 x 2 x 3 x 5 

61 = 61 

62 = 2 x 31 

63 = 3 x 3 x 7 

64 = 2 x 2 x 2 x 2 x 2 x 2

以下是代码：

import java.util.Scanner;

public class PrimeFact {

    public static void main(String[] args) {
        int start, stop;
        int number = 0;

        Scanner input = new Scanner(System.in);
        System.out.println("Starting value (at least 2): ");
        start = input.nextInt();
        System.out.println("Ending value (at least 2): ");
        stop = input.nextInt();

        // stops the program if the user entered n input that cannot be factored
        if (start < 2 || stop < 2) {
            System.out.println("Amount must be at least 2 rather than " + start + " and " + stop + ". Quitting.");
            System.exit(0);
        } // end if

        // loop
        // calls factors
        for (int i = start; i <= stop; i++) {
            number = i;
            printFactors(i);
            System.out.println();
        } // ends loop

    }// ends main

    // prints prime factors
    public static void printFactors(int number) {
        int out = number;
        int count = 0;
        System.out.print(out + " = ");
        for (int factor = 2; factor <= number; factor++) {
            int exponent = 0;
            while (number % factor == 0) {
                number /= factor;
                exponent++;
                count++;
            }
            if (exponent > 0) {
                printExponents(exponent, factor, count);

            }
        }
    }

    //prints the factors the required number of times
    public static void printExponents(int exponent, int factor, int count) {

        for (int q = 1; q <= exponent; q++) {
            System.out.print(factor + " x ");
            // if (q /= count) {
            // System.out.print(factor);
            // }
        }
    }

}// ends class

Answer 1

进入printFactors附近的ints声明添加

boolean hadFactor = false;

还修改你的电话：

if (exponent > 0) {
            printExponents(exponent, factor, count, hadFactor);
            hadFactor=true; 

        }

并在printExponents中执行

public static void printExponents(int exponent, int factor, int count, boolean hadFactor) {

    for (int q = 1; q <= exponent; q++) {
        if (hadFactor){System.out.print(" x ")}
        System.out.print(factor);
        hadFactor=true;
        // if (q /= count) {
        // System.out.print(factor);
        // }
    }

我怎样才能使最后一个乘法符号不包含在阶乘线中？

1 个答案: