用java实现分数各种运算(加减乘除，求余，求幂，求两个数中的较大值，较小值)

用java实现分数各种运算(加减乘除，求余，求幂，求两个数中的较大值，较小值)

1，要求

     用户以分数形式输入，以分数形式输出，用java语言实现分数中的各种运算(加减乘除，求余，求幂，求两个数中的较大值，较小值）

2，java代码（+详细注释）

      2.1 代码

package Rational;

import java.util.StringTokenizer;
/**
 * @author SunKun
 * 分数四则运算
 */
public class Calculator {
	int numerator;  // 分子
	int denominator; // 分母
	
	Calculator(){
	}

	Calculator(int a,int b){
		if(a == 0){
			numerator = 0;
			denominator = 1;
		}
		else{
			setNumeratorAndDenominator(a,b);
		}
	}
	
	void setNumeratorAndDenominator(int a, int b){  // 设置分子和分母
		int c = f(Math.abs(a),Math.abs(b));         // 计算最大公约数
		numerator = a / c;
		denominator = b / c;
		if(numerator<0 && denominator<0){
			numerator = - numerator;
			denominator = - denominator;
		}
	}
	
	int getNumerator(){
		return numerator;
	}

	int getDenominator(){
		return denominator;
	}
	
	int f(int a,int b){  // 求a和b的最大公约数
		if(a < b){
			int c = a;
			a = b;
			b = c;
		}
		int r = a % b;
		while(r != 0){
			a = b;
			b = r;;
			r = a % b;
		}
		return b;
	}
	
	Calculator add(Calculator r){  // 加法运算
		int a = r.getNumerator();
		int b = r.getDenominator();
		int newNumerator = numerator * b + denominator * a;
		int newDenominator = denominator * b;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}
	
	Calculator sub(Calculator r){  // 减法运算
		int a = r.getNumerator();
		int b = r.getDenominator();
		int newNumerator = numerator * b - denominator * a;
		int newDenominator = denominator * b;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	} 
	
	Calculator muti(Calculator r){ // 乘法运算
		int a = r.getNumerator();
		int b = r.getDenominator();
		int newNumerator = numerator * a;
		int newDenominator = denominator * b;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}
	
	Calculator div(Calculator r){  // 除法运算
		int a = r.getNumerator();
		int b = r.getDenominator();
		int newNumerator = numerator * b;
		int newDenominator = denominator * a;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}
	
	static Calculator qiuyu(double left,double right){ // 求余运算
		double point_result = Math.IEEEremainder(left, right);
		int r1 = (int)point_result;
		double r2 = point_result - r1;
		int newNumerator = r1*10000 + (int)(r2*10000);
        int newDenominator = 10000;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}
	
	static Calculator pow(double left,double right){ // 求幂运算left^right
		double point_result = Math.pow(left, right);
		int r1 = (int)point_result;
		double r2 = point_result - r1;
		int newNumerator = r1*10000 + (int)(r2*10000);
        int newDenominator = 10000;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}
	
	static Calculator max(double left,double right){ // 求两数中的较大值
		double point_result = Math.min(left, right);
		int r1 = (int)point_result;
		double r2 = point_result - r1;
		int newNumerator = r1*10000 + (int)(r2*10000);
        int newDenominator = 10000;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}
	
	static Calculator min(double left,double right){ // 求两数中的较小值
		double point_result = Math.min(left, right);
		int r1 = (int)point_result;
		double r2 = point_result - r1;
		int newNumerator = r1*10000 + (int)(r2*10000);
        int newDenominator = 10000;
		Calculator result = new Calculator(newNumerator,newDenominator);
		return result;
	}	
	
	// 封装了具体运算，主要为对输入进行转换，对输出封装
	public static void compute(String data1,String operation,String data2){
		StringTokenizer fenxi = new StringTokenizer(data1,"/");
	    int data1_1 = Integer.parseInt(fenxi.nextToken());
	    int data1_2 = Integer.parseInt(fenxi.nextToken());
		fenxi = new StringTokenizer(data2,"/");
	    int data2_1 = Integer.parseInt(fenxi.nextToken());
	    int data2_2 = Integer.parseInt(fenxi.nextToken());
	    	    
		Calculator r1 = new Calculator(data1_1,data1_2);
		Calculator r2 = new Calculator(data2_1,data2_2);
		
		Calculator result;
		int a,b;
		if(operation.equals("+")){ // 两数相加
 			result = r1.add(r2);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);
		}
		
		if(operation.equals("-")){ // 两数相减
 			result = r1.sub(r2);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);
		}
		
		if(operation.equals("*")){ // 两数相乘
 			result = r1.muti(r2);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);
		}
		
		if(operation.equals("/")){ // 两数相除
 			result = r1.div(r2);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);
		}
		
		if(operation.equals("%")){ // 两数求余
			double left = (double)data1_1/(double)data1_2;
			double right = (double)data2_1/(double)data2_2;
			result = qiuyu(left,right);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);
		}
		
		if(operation.equals("^")){ // 两数求幂
			double left = (double)data1_1/(double)data1_2;
			double right = (double)data2_1/(double)data2_2;
			result = pow(left,right);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);			
		}
		
		if(operation.equals("max")){ // 两数中的较大值
			double left = (double)data1_1/(double)data1_2;
			double right = (double)data2_1/(double)data2_2;
			result = max(left,right);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);				
		}
		
		if(operation.equals("min")){ // 两数中的较小值
			double left = (double)data1_1/(double)data1_2;
			double right = (double)data2_1/(double)data2_2;
			result = min(left,right);
			a = result.getNumerator();
 			b = result.getDenominator();
			System.out.println(data1+" "+operation+" " +data2+" = " + a + "/" + b);				
		}
	}
}

package Rational;

import java.util.Scanner;
/**
 * @author SunKun
 * 分数各种运算的主函数
 * */
public class TestCal {
	public static void main(String[] args) {
		// TODO Auto-generated method stub		
		while(true){
			
			// 用户输入两分数和运算符
			System.out.println("---------------------------------");
			Scanner input = new Scanner(System.in);
			System.out.println("请用户输入第一个分数(格式a/b)");
			String data1 = input.next();
			System.out.println("加减乘除:+-*/,求余求幂:%,^,求两数中较大值较小值max,min");
			System.out.println("请用户输入要进行运算的运算符符号");
			String operation = input.next();
			System.out.println("请用户输入第二个分数(格式c/d)");
			String data2 = input.next();
				
			// 根据用户输入进行具体运算
			Calculator cal = new Calculator();
			System.out.println("运算结果为:");
			cal.compute(data1, operation, data2);		
		}	
	}
}

2.2 测试代码

public class Test1{
	/**
	 * @author SunKun
	 * 测试所进行的分数各种运算
	 */
	public static void main(String[] args) {
		// 测试所用数据
		double data1 = 0.25;
		double data2 = 0.2;
		
		// java自带类库
		double result1 = data1 + data2;  // 加
		double result2 = data1 - data2;  // 减
		double result3 = data1 * data2;  // 乘
		double result4 = data1 / data2;  // 除
		double result5 = Math.IEEEremainder(data1, data2);  // 求余
		double result6 = Math.pow(data1,data2);  // 求幂
		double result7 = Math.max(data1, data2);  // 求两数中的较大值
		double result8 = Math.min(data1, data2);  // 求两数中的较小值
		
		// 输出运算结果
		System.out.println(data1 + " + " + data2 + " = " + result1);
		System.out.println(data1 + " - " + data2 + " = " + result2);
		System.out.println(data1 + " * " + data2 + " = " + result3);
		System.out.println(data1 + " / " + data2 + " = " + result4);
		System.out.println(data1 + " % " + data2 + " = " + result5);
		System.out.println(data1 + " ^ " + data2 + " = " + result6);
		System.out.println(data1 + " max " + data2 + " = " + result7);
		System.out.println(data1 + " min " + data2 + " = " + result8);
	}
}

3.运算结果截图

3.1 代码

（1）

（2）

（3）

（4）

（5）

（6）

（7）

（8）

3.2测试

（9）

4.备注

    扩展自自己的以前的一篇博客，链接为：http://blog.csdn.net/u010043538/article/details/12175705

如果您有好的想法或建议，欢迎留言，大家共同学习进步