Issues with Yellow and Green

Question about the task

Crossing the road blindly

Java Syntax, Level 4, Lesson 4

Under discussion

Green is ok, Issues with Yellow and Green.

package com.codegym.task.task04.task0416;

/*
Crossing the road blindly

*/

import java.io.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String enter = reader.readLine();
        double time = Double.parseDouble(enter);
        int time1 = (int)time;
        if(time>=5){
            if(time!=time1){
                time = (time1%5) + (time1-time);
            }
            else{
                time = time%5;

            }

        }
        if(time>=0 && time<3){
            System.out.println("green");
        }
        else if(time>=3 && time<4){
            System.out.println("yellow");
        }

        else if(time>=4 && time<5){
            System.out.println("red");
        }


    }
}

The pedestrian traffic light is programmed as follows:
at the beginning of each hour, the green signal is on for three minutes,
then the signal is yellow for one minute,
and then it is red for one minute.
Then the light is green again for three minutes, etc.
Use the keyboard to enter a real number t that represents the number of minutes that have elapsed since the beginning of the hour.
Determine what color the traffic light is at the specified time.
Display the result as follows:
"green" if the light is green,
"yellow" if the light is yellow, and
"red" if the light is red.

Example for 2.5:
green
Example for 3:
yellow
Example for 4:
red
Example for 5:
green

Requirements:

The program should read a real number from the keyboard.
The program should display text on the screen.
If the light is green, display: "green"
If the light is yellow, display: "yellow"
If the light is red, display: "red"

package com.codegym.task.task04.task0416; /* Crossing the road blindly */ import java.io.*; public class Solution { public static void main(String[] args) throws Exception { //write your code here BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String enter = reader.readLine(); double time = Double.parseDouble(enter); int time1 = (int)time; if(time>=5){ if(time!=time1){ time = (time1%5) + (time1-time); } else{ time = time%5; } } if(time>=0 && time<3){ System.out.println("green"); } else if(time>=3 && time<4){ System.out.println("yellow"); } else if(time>=4 && time<5){ System.out.println("red"); } } }

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William Hoang

Level 10 , Hanoi, Viet Nam

2 July 2019, 02:02

time1-time > 0 or time1-time < 0 ? if time = 1.1 -> time1 = 1 if time = 1.9 -> time1 = 2 your condition maybe is not correct :D The Real number can do this math with %

float time = Float.parseFloat(enter);
if (time%5 < 3) System.out.println("green");
if (time%5 >=3 && time%5 <4) System.out.println("yellow");
if (time%5 >= 4) System.out.println("red");

Hrishikesh Kalita

Level 8 , Guwahati, India

12 July 2019, 12:29

Thank you for your reply, but I think the 'int' cast won't round off the number. Please check the screenshot attached. Both the outputs are '1'. The second output is '1' too, irrespective of whether the time variable was 1.1 or 1.9