//8.17 Rational Numbers
package RationalNumbers;
import java.util.*;
import java.text.Format;
public class Rational {
int numberator;//分子
int denominator;//分母
//无参构造函数
public Rational(){
numberator = 0;
denominator = 1;
}
//有参构造函数
public Rational(int n,int d){
if(d == 0) {
System.out.println("分母不能为0！请重新输入：");
Rationaltest.newclass();
}
else{
numberator = n;
denominator = d;
reducedform(this);
}
}
//约分
private void reducedform(Rational r) {
// TODO Auto-generated method stub
int min;
if(r.numberator>r.denominator) min = r.denominator;
else min = r.numberator;
for(int i = 2;i<=min;i++){
while(r.numberator%i == 0&&r.denominator%i == 0){
r.numberator = r.numberator/i;
r.denominator = r.denominator/i;
min = min/i;
}
}
}
//通分
public void tongfen(Rational r1,Rational r2){
int max;
if(r1.denominator>r2.denominator) max = r1.denominator;
else max = r2.denominator;
for(int i = max;i<=r1.denominator*r2.denominator;i++){
if(i%r1.denominator==0 && i%r2.denominator==0){
int n1 = i /r1.denominator;
int n2 = i/r2.denominator;
r1.denominator = i;
r1.numberator = r1.numberator*n1;
r2.denominator = i;
r2.numberator = r2.numberator*n2;
break;
}
}
}
//相加
public Rational add(Rational r1,Rational r2){
Rational r = new Rational();
tongfen(r1,r2);
r.denominator = r1.denominator;
r.numberator = r1.numberator+r2.numberator;
reducedform(r);
System.out.println("结果相加为：");
return r;
}
//想减
public Rational subtract(Rational r1,Rational r2){
Rational r = new Rational();
tongfen(r1,r2);
r.denominator = r1.denominator;
if(r1.numberator>=r2.numberator)
r.numberator = r1.numberator-r2.numberator;
else r.numberator = r2.numberator -r1.numberator;
reducedform(r);
System.out.println("\n结果相减为：");
return r;
}
//相乘
public Rational multiply(Rational r1,Rational r2){
Rational r = new Rational();
r.denominator = r1.denominator*r2.denominator;
r.numberator = r1.numberator*r2.numberator;
reducedform(r);
System.out.println("\n结果相乘为：");
return r;
}
//相除
public Rational divide(Rational r1,Rational r2){
Rational r = new Rational();
if(r2.numberator == 0) System.out.println("零不能做除数！");
else{
r.denominator = r1.denominator*r2.numberator;
r.numberator = r1.numberator*r2.denominator;
reducedform(r);
System.out.println("\n结果相除为：");
}
return r;
}
//打印分数形式
public void printRational(){
System.out.println("分数形式为：");
System.out.println(numberator+"/"+denominator);
}
//打印有理数形式
public void printfloat(){
String s;
Scanner reader = new Scanner(System.in);
System.out.println("请输入小数点后保留位数：");
s = reader.next();
System.out.println("有理数形式为：");
Formatter f = new Formatter(System.out);
if(numberator == 0) System.out.printf("0");
else
f.format("%10."+s+"f", (float)numberator/denominator);
}
}
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