57個挑戰(python+java)-lesson29

上題目

python 版本

import re


class Rateforreturn:
    rstr = ""

    def GetInput(this):
        this.rstr = input("What is the rate of return \n")

    def isnumerical(this):
        return this.rstr != "" and re.match("^\d+\.?\d*#34;, this.rstr) != None

    def JudgeInput(this):
        if this.isnumerical() == True:
            if float(this.rstr) == 0:
                print("Sorry. That's a not a valid input")
                return 0
            else:
                years = 72 / float(this.rstr)
                print("It will take {0} years to double your initial investment".format(years))
                return 1
        else:
            print("Sorry, should be numerical numbers")
            return 0


lesson29 = Rateforreturn()
lesson29.GetInput()
while lesson29.JudgeInput() == 0:
    lesson29.GetInput()
           

運作效果圖

java 版本

import java.util.Scanner;
public class RateforReturn{
private String rstr = "";
private Scanner sc = new Scanner(System.in );

void GetInput(){
System.out.println("What is the rate of return ");
this.rstr = sc.nextLine();
}

static boolean isnumerical(String str1){
return str1.equals("") == false & & str1.matches("^\\d+\\.?\\d*#34;);
}

boolean JudgeInput2()
{
if (isnumerical(this.rstr) == true)
    {
    if (Float.parseFloat(this.rstr) == 0)
    {
        System.out.println("Sorry, That's not a valid input ");
         return false;
}
else {
float years = 72 / Float.parseFloat(this.rstr);
System.out.println("It will take " + years + " years to double your initial investment");
return true;
}
}
else {
    System.out.println("Sorry , should be numerical numbers");
    return false;
}
}

public static void main(String[] args){
RateforReturn lesson29 = new RateforReturn();
lesson29.GetInput();
while (lesson29.JudgeInput2() == false)
   {
     lesson29.GetInput();
   }
}
}           

運作效果圖