Java—分数四则运算

你的名字 2022-11-20 04:53 204阅读 0赞

## Java—分数四则运算 ##

Description  
编写程序，实现两个分数的加减法

Input  
输入包含多行数据；

每行数据是一个字符串，格式是"a/boc/d"，其中a, b, c, d为数字（每个数字保证为正数并且不存在正号）。o是运算符"+“或者”-","\*",""。

数据以EOF结束，输入数据保证合法。

Output  
直接输出结果，并且注意结果应符合书写习惯，没有多余的符号、分子、分母，并且化简至最简分数形式。

Sample  
Input  
1/100+3/100  
1/4-1/2  
1/3-1/3  
1/2\*2/1  
1/2\\1/2  
Output  
1/25  
\-1/4  
0  
1  
1

import java.util.Scanner;
    
    class Opertion {
        
    	int a, b, c, d, m, n;
    
    	public Opertion(int a, int b, int c, int d) {
        
    		this.a = a;
    		this.b = b;
    		this.c = c;
    		this.d = d;
    	}
    //分式约分
    	public void print(int m, int n) {
        
    		int x = Math.abs(m);
    		int y = Math.abs(n);
    		if (x < y) {
        
    			int t = x;
    			x = y;
    			y = t;
    		}
    		while (y != 0) {
        
    			int k = x % y;
    			x = y;
    			y = k;
    		}
    		m = m / x;
    		n = n / x;
    		if (n == 1)
    			System.out.println(m);
    		else
    			System.out.println(m + "/" + n);
    	}
    //四则运算
    	public void sum() {
        
    		m = a * d + b * c;
    		n = b * d;
    		print(m, n);
    	}
    
    	public void jian() {
        
    		m = a * d - b * c;
    		n = b * d;
    		print(m, n);
    	}
    
    	public void cheng() {
        
    		m = a * c;
    		n = b * d;
    		print(m, n);
    	}
    
    	public void chu() {
        
    		m = a * d;
    		n = b * c;
    		print(m, n);
    	}
    //判断四则运算类型
    	public void oper(String s) {
        
    		for (int i = 0; i < s.length(); i++) {
        
    			char ss = s.charAt(i);
    			if (ss == '+') {
        
    				sum();
    				break;
    			} else if (ss == '-') {
        
    				jian();
    				break;
    			} else if (ss == '*') {
        
    				cheng();
    				break;
    			} else if (ss == '\\') {
        
    				chu();
    				break;
    			}
    		}
    	}
    }
    
    public class Main {
        
    
    	public static void main(String[] args) {
        
    		// TODO Auto-generated method stub
    		Scanner reader = new Scanner(System.in);
    		while (reader.hasNext()) {
        
    			String str;
    			str = reader.nextLine();
    			String s1[] = str.split("\\+|\\-|\\*|\\\\");//分离出两个分式
    			String fir[] = s1[0].split("/");//将第一个分式的分子和分母分离并求出值
    			int a = Integer.parseInt(fir[0]);
    			int b = Integer.parseInt(fir[1]);
    			String sec[] = s1[1].split("/");//将第二个分式的分子和分母分离并求出值
    			int c = Integer.parseInt(sec[0]);
    			int d = Integer.parseInt(sec[1]);
    			Opertion opertion = new Opertion(a, b, c, d);
    			opertion.oper(str);
    		}
    	}
    
    }