用于计算分数的Java程序

问题描述

该程序的目的是获得一个分数的两个用户输入，从用户接收一个操作员，然后为另一个分数获得两个更多的用户输入。程序必须检查两个分数中使用的数字范围在0-99之间并且分母不为零。该程序还必须确保用户输入一个有效的运算符（ - ，+，*，/）。

我现在面临的唯一问题是没有我的变量正在初始化，我不知道如何使输出如下所示：

  1 1 3 
 --- + --- = --- 
 4 8 8 
  

这里是我到目前为止的代码，任何帮助将不胜感激，因为我对使用java的知识是最小的：

  import java。 util.Scanner; 
 public class FractionCalculator {
 public static void main（String [] args）{
 Scanner in = new Scanner（System.in）; 
 
 int n1; 
 int n2; 
 int d1; 
 int d2; 
 int n; 
 int d; 
 char o; 
 int m1，m2; 
 int tempN1，tempN2; 
 int lcm，x; 
 
 System.out.println（输入分子1的分子：）; 
 n1 = in.nextInt（）; 
 System.out.println（输入分数1的分母：）; 
 d1 = in.nextInt（）; 
 
 if（d1> 0）{
 System.out.println（）; 
} else {
 System.out.println（Invalid denominator）; 
 System.exit（0）; 
} 
 
 System.out.println（Enter an operator：）; 
 o = in.next（）。toCharArray（）[0]; 
 System.out.println（输入分数2的分子：）; 
 n2 = in.nextInt（）; 
 System.out.println（输入分数2的分母：）; 
 d2 = in.nextInt（）; 
 
 if（d2> 0）{
 System.out.println（）; 
} else {
 System.out.println（Invalid denominator）; 
 System.exit（0）; 
 
 
 $ b switch（o）{
 case'*'：
 n = n1 * n2; 
 d = d1 * d2; 
休息; 
 
案例'/'：
 n = n1 * d2; 
 d = n2 * d1; 
休息; 
 
 case'+'：
 int max = n1> d1？n1：d1; 
 int min = n1  for（int i = 1; i  x = max * i; 
 if（x％min == 0）
 lcm = x; 
 tempN1 = n1 * m1; 
 tempN2 = n2 * m2; 
 m1 = lcm / d1; 
 m2 = 1cm / d2; 
 n = tempN1 + tempN2; 
 d = lcm; 
休息; 
 
案例' - '：
 n = tempN1  -  tempN2; 
 d = lcm; 
休息; 
默认值：
 System.out.println（非法操作符：+ o）; 
休息; } 
} 
} 
  

解决方案

更新：

请注意，这是我的不完整和/或最佳解决方案，但至少它应该带您进入正确的方向。你仍然必须减少分数并做一些其他的调整。

  import java.math.BigInteger; 
 import java.util.Scanner; 
 
 public class FractionCalculator {
 public static void main（String [] args）{
 Scanner in = new Scanner（System.in）; 
 
 int n1; 
 int n2; 
 int d1; 
 int d2; 
 int n = 0; 
 int d; 
 char o; 
 
 System.out.println（输入分子1的分子：）; 
 n1 = in.nextInt（）; 
 System.out.println（输入分数1的分母：）; 
 d1 = in.nextInt（）; 
 
 if（d1> 0）{
 System.out.println（）; 
} else {
 System.out.println（Invalid denominator）; 
 System.exit（0）; 
} 
 
 System.out.println（Enter an operator：）; 
 o = in.next（）。toCharArray（）[0]; 
 System.out.println（输入分数2的分子：）; 
 n2 = in.nextInt（）; 
 System.out.println（输入分数2的分母：）; 
 d2 = in.nextInt（）; 
 
 if（d2> 0）{
 System.out.println（）; 
} else {
 System.out.println（Invalid denominator）; 
 System.exit（0）; 
 
 
 switch（o）{
 case'*'：
 n = n1 * n2; 
 d = d1 * d2; 
 
 break; 
 
案例'/'：
 n = n1 * d2; 
 d = n2 * d1; 
 
 break; 
 
 case'+'：
 case' - '：
 
 d = gcd（d1，d2）; 
 
 n1 * = d / d1; 
 n2 * = d / d2; 
 
 if（o =='+'）{
 n = n1 + n2; 
} 
 else if（o ==' - '）{
 n = n1  -  n2; 
} 
 
 break; 
默认值：
 System.out.println（非法操作符：+ o）; 
 return; 
} 
 
 System.out.printf（％d％d％d \ n，n1，n2，n）; 
 System.out.printf（---％c --- = --- \\\
，o）; 
 System.out.printf（％d％d％d \ n，d1，d2，d）; 
 
 $ b $ private static int gcd（int d1，int d2）{
 BigInteger gcd = new BigInteger（String.valueOf（d1））。gcd（new BigInteger（String。的valueOf（D2）））; 
 return gcd.intValue（）; 
} 
} 
  

The purpose of the program is to get two user inputs for a fraction, receive a operator from the user, and then to get two more user inputs for a second fraction. The program must check that the numbers used in both fractions range between 0-99 and have a non-zero denominator. The program also has to make sure that the user inputs a valid operator (-,+,*,/).

The only problem I am facing now is that none of my variables are being initialized and that I don't know how to make the output look like so:

 1     1      3
--- + ---  = ---
 4     8      8

Here is the code I have so far, any help would be much appreciated because my knowledge for using java is minimal:

import java.util.Scanner;
public class FractionCalculator {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);

int n1;
int n2;
int d1;
int d2;
int n;
int d;
char o;
int m1,m2;
int tempN1, tempN2;
int lcm, x;

System.out.println("Enter a numerator for fraction 1: ");
n1 = in.nextInt();
System.out.println("Enter a denominator for fraction 1: ");
d1 = in.nextInt();

if  (d1 > 0) {
  System.out.println();
} else {
  System.out.println("Invalid denominator");
  System.exit(0);
}

System.out.println("Enter an operator: ");
o = in.next().toCharArray()[0];
System.out.println("Enter a numerator for fraction 2: ");
n2 = in.nextInt();
System.out.println("Enter a denominator for fraction 2: ");
d2 = in.nextInt();

if (d2 > 0) {
  System.out.println();
} else {
  System.out.println("Invalid denominator");
  System.exit(0);
}


switch(o){
    case '*':
        n = n1 * n2;
        d = d1 * d2;
        break;

    case '/':
        n = n1 * d2;
        d = n2 * d1;
        break;

    case '+':
        int max=n1>d1?n1:d1;
        int min=n1<d1?n1:d1;
        for(int i=1;i<=min;i++)
            x=max*i;
            if (x%min==0)
            lcm=x;
        tempN1=n1*m1;
        tempN2=n2*m2;
        m1=lcm/d1;
        m2=lcm/d2;
        n = tempN1 + tempN2;
        d = lcm;
        break;

    case '-':
        n = tempN1 - tempN2;
        d = lcm;
        break;
    default:
        System.out.println("Illegal Operator: "+ o);
        break; }
 }
}

解决方案

UPDATE:

Be aware that this is my no means complete and/or the best solution, but at least it should take you in the right direction. You will still have to reduce fractions and do some other tweaks.

import java.math.BigInteger;
import java.util.Scanner;

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

        int n1;
        int n2;
        int d1;
        int d2;
        int n = 0;
        int d;
        char o;

        System.out.println("Enter a numerator for fraction 1: ");
        n1 = in.nextInt();
        System.out.println("Enter a denominator for fraction 1: ");
        d1 = in.nextInt();

        if (d1 > 0) {
            System.out.println();
        } else {
            System.out.println("Invalid denominator");
            System.exit(0);
        }

        System.out.println("Enter an operator: ");
        o = in.next().toCharArray()[0];
        System.out.println("Enter a numerator for fraction 2: ");
        n2 = in.nextInt();
        System.out.println("Enter a denominator for fraction 2: ");
        d2 = in.nextInt();

        if (d2 > 0) {
            System.out.println();
        } else {
            System.out.println("Invalid denominator");
            System.exit(0);
        }

        switch (o) {
            case '*':
                n = n1 * n2;
                d = d1 * d2;

                break;

            case '/':
                n = n1 * d2;
                d = n2 * d1;

                break;

            case '+':
            case '-':

                d = gcd(d1, d2);

                n1 *= d / d1;
                n2 *= d / d2;

                if(o == '+') {
                    n = n1 + n2;
                }
                else if(o == '-') {
                    n = n1 - n2;
                }

                break;
            default:
                System.out.println("Illegal Operator: " + o);
                return;
        }

        System.out.printf(" %d     %d     %d\n", n1, n2, n);
        System.out.printf("--- %c --- = ---\n", o);
        System.out.printf(" %d     %d     %d\n", d1, d2, d);
    }

    private static int gcd(int d1, int d2) {
        BigInteger gcd = new BigInteger(String.valueOf(d1)).gcd(new BigInteger(String.valueOf(d2)));
        return gcd.intValue();
    }
}

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