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)

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^rightdouble 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);		}	}
}

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);}
}