Java分数的加减乘除

import java.util.Scanner;public class demo {public static class Person{public int molecularone; //分子public int denominatorone; //分母public String symbol;public int moleculartwo;public int denominatortwo;public int resultone=0;public int resulttwo=0;public Person(int nextInt, int nextInt1, String next, int nextInt2, int nextInt3) {molecularone=nextInt ; //分子denominatorone=nextInt1 ; //分母symbol=next ;moleculartwo=nextInt2 ;denominatortwo=nextInt3 ;}//求最小公倍数        static int gcd(int x,int y){int r;while( y!= 0) {r = x%y;x = y;y = r;}return x;}//加法public  void addItion() {if (denominatorone == denominatortwo) {resulttwo = denominatortwo;resultone = molecularone + moleculartwo;} else {resulttwo = denominatorone * denominatortwo;resultone = molecularone * denominatortwo + moleculartwo * denominatorone;}int gcd=gcd(resultone ,resulttwo );if(gcd>0||(resultone>0&&resulttwo >0 )||(resultone<0&&resulttwo <0)) {//防止有的数被去符号化resultone = resultone / gcd;resulttwo = resulttwo / gcd;}else {resultone = resultone / -gcd;resulttwo = resulttwo / -gcd;}if (resultone == 0) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + "0");} else if (resulttwo == 1) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone );} else {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone + "/" + resulttwo);}}//减法public  void subtraction(){if(denominatorone ==denominatortwo ){resulttwo =denominatortwo ;resultone =molecularone -moleculartwo ;}else{resulttwo =denominatorone *denominatortwo ;resultone = (molecularone * denominatortwo) - (moleculartwo * denominatorone);}int gcd=gcd(resultone ,resulttwo );if(gcd>0||(resultone>0&&resulttwo >0 )||(resultone<0&&resulttwo <0)) {resultone = resultone / gcd;resulttwo = resulttwo / gcd;}else {resultone = resultone / -gcd;resulttwo = resulttwo / -gcd;}if (resultone == 0) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + "0");} else if (resulttwo == 1) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone );} else {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone + "/" +resulttwo  );}}//乘法public void multiplication (){resultone =molecularone *moleculartwo ;resulttwo =denominatorone *denominatortwo ;int gcd=gcd(resultone ,resulttwo );if(gcd>0||(resultone>0&&resulttwo >0 )||(resultone<0&&resulttwo <0)) {resultone = resultone / gcd;resulttwo = resulttwo / gcd;}else {resultone = resultone / -gcd;resulttwo = resulttwo / -gcd;}if (resultone == 0) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + "0");} else if (resulttwo == 1) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone );} else {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone + "/" + resulttwo);}}//除法public void division ( ){resultone =molecularone *denominatortwo ;resulttwo =denominatorone *moleculartwo ;int gcd=gcd(resultone ,resulttwo );if(gcd>0||(resultone>0&&resulttwo >0 )||(resultone<0&&resulttwo <0)) {resultone = resultone / gcd;resulttwo = resulttwo / gcd;}else {resultone = resultone / -gcd;resulttwo = resulttwo / -gcd;}if (resultone == 0) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + "0");} else if (resulttwo == 1) {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone );} else {System.out.println("(" + molecularone + "/" + denominatorone + ")" + symbol + "(" + moleculartwo + "/" + denominatortwo + ")" + "=" + resultone + "/" + resulttwo);}}}public static void main(String[] args) {Scanner cin = new Scanner(System.in);while (cin.hasNext()) {int molecularone= cin.nextInt(); //分子int denominatorone=cin .nextInt() ; //分母String symbol=cin .next() ;int moleculartwo=cin .nextInt() ;int denominatortwo=cin .nextInt() ;Person person = new Person(molecularone ,denominatorone ,symbol ,moleculartwo,denominatortwo  );if (symbol  .equals("+") ) {person.addItion();} else if (symbol  .equals("-") ) {person.subtraction();} else if (symbol .equals("*") ) {person.multiplication();}else if(symbol .equals("/") ) {person.division();}}}
}

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