需要考慮到問題：

乘積超出int范圍

真、假分數

分母為0

import java.io.*;public class Main {private static long gcd(long a,long b) {//輾轉相除法return b == 0 ? a : gcd(b , a % b);}private static String calculate(long a,long b) {//先化簡兩個分數if(b == 0) {return "Inf";}long gcd,t,x;gcd = gcd(Math.abs(a), b); //最大公約數，Math.abs(x)返回x的絕對值a = a / gcd;b = b / gcd;t = Math.abs(a) / b; //整數x = Math.abs(a) - t * b;//分子if(t == 0 && x == 0) {return "0";}if(a < 0) {if(t != 0 && x != 0)return "(-"+t+" "+x+"/"+b+")";if(t != 0 && x == 0)return "(-"+t+")";if(t == 0 && x != 0)return "(-"+x+"/"+b+")";} else {if (t != 0 && x != 0)return t+" "+x+"/"+b;if(t != 0 && x == 0)return String.valueOf(t);if(t == 0 && x != 0)return x+"/"+b;}return null;}public static void main(String[] args) throws IOException {BufferedReader in = new BufferedReader(new InputStreamReader(System.in));PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));String[] y = in.readLine().split(" ");String[] a = y[0].split("/"), b = y[1].split("/");long a1 = Long.parseLong(a[0]), a2 = Long.parseLong(b[0]);long b1 = Long.parseLong(a[1]), b2 = Long.parseLong(b[1]);String A,B;A = calculate(a1,b1);B = calculate(a2,b2);out.println(A + " + " + B + " = " + calculate(a1*b2+a2*b1,b1*b2));out.println(A + " - " + B + " = " + calculate(a1*b2-a2*b1,b1*b2));out.println(A + " * " + B + " = " + calculate(a1*a2,b1*b2));out.print(A + " / " + B + " = ");if(a2 < 0) {out.print(calculate(a1 * b2 * a2 / Math.abs(a2) , b1 * Math.abs(a2)));} else {out.print(calculate(a1 * b2 , b1 * a2));}out.flush();} }

總結

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