I'm writing a program to calculate the wind chill based on a temperature and wind speed entered by the user. The formula to calculate wind chill is

Wind Chill = 35.74 + 0.6215T - 35.75V0.16 + 0.4275TV0.16

My current code is

import java.util.Scanner;
import java.util.Math;
public class WindChill {

public static void main(String[] args) {
	
	//Declare variables

	double windChill;
	double temperature;
	int    windSpeed;

//Ask the user for temperature and wind speed

System.out.print("Enter the temperature (Fahrenheit):  ");
	Scanner input = new Scanner (System.in);
	temperature = input.nextDouble();

System.out.print("Enter the wind speed(mph):  ");
	windSpeed = input.nextInt();

	
//Display the wind chill value

windChill = (35.74+(0.6215*temperature)) - (Math.pow(35.75*windSpeed,0.16)) + (Math.pow(0.4275*temperature*windSpeed,0.16));	
System.out.print("The wind chill index is " + windChill);
}

}

I get an error in the IDE on line 2 that says "the import java.util.Math could not be resolved". Also, when I try to run the program, I get the error message

"Exception in thread "main" java.lang.Error: Unresolved compilation problem: 

at WindChill.main(WindChill.java:6)

I checked my installed JREs and I am using JRE7. Can anybody tell me what is wrong?

I have been trying to use the Apache Commons Math library in my code. I have been having trouble importing it. I'm new to downloading libraries/packages outside of the built-in java packages. It feels like I have tried everything, and I might just be missing an obvious detail. I am using a Windows 11 machine.

I have tried the following with the most recent release of the Apache Commons Math library (3.6.1) and the most recent version (4.0).

The error that I get every compile time is: package org.apache.commons does not exist.

I have installed IntelliJ IDE and tried

• adding it as a library in the project structure (under project settings)

• and adding it as a dependency in the build.gradle file (implementation 'org.apache.commons:commons-math4:4.0').

I have installed Eclipse IDE and tried

• importing the JAR files into the src folder.

• I have tried following the steps in this article (add User Library -> add external JAR(s) -> fill in Javadoc location -> configure build path).

I have tried adding the directories containing the JAR files to CLASSPATH using Control Panel (edit system variables).

I'm still somewhat confused as to why there are multiple JAR files in the directory that you get after unzipping the library and as to which one(s) I'm supposed to be using directly. But, I tried extracting the class files using the jar xf command in the terminal from what I thought were the important JAR files (commons-math4-legacy-4.0-beta1.jar and commons-math3-3.6.1.jar). I then tried

• adding the resulting org directory to CLASSPATH

• and tediously grouping all of the class files from all of the subdirectories into one single directory and adding that directory to CLASSPATH.

I have tried using these directories by compiling with javac -cp path/to/JAR/file/filename.jar *.java, which by my understanding does the same thing as adding them to CLASSPATH in Control Panel but I tried it anyway.

I even tried downloading the source version of the library and collecting all of the .java files into one single directory.

I also tried what the answerer suggested here, and it did not work.

Do you know what I am doing wrong? Let me know if I need to provide any more info. Thank you!