Workbook 4.3

From the Java Bootcamp Resources, launch the Workbook 4.3 folder.

Weather

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These are the temperatures for noon, evening, and midnight in Fahrenheit. We need to convert them to Celsius.

public static void main(String[] args) {

   double noon = 77;          //temperature in fahrenheit.
   double evening = 61;       //temperature in fahrenheit
   double midnight = 55;      //temperature in fahrenheit

}

Task 1 - Write a function

You will write a function that converts Fahrenheit to Celcius.

• Function name.

/**
 * Function name: fahrenheitToCelsius. <-----
 * @param fahrenheit (double)
 * @return celsius (double)
 *
 * Inside the function:
 *  1. return the celsius temperature.    C = (F - 32) * 5/9
 */

• Parameter.

/**
 * Function name: fahrenheitToCelsius.
 * @param   fahrenheit (double)  <------
 * @return  celsius   (double)
 *
 * Inside the function:
 *  1. return the celsius temperature.   C = (F - 32) * 5/9
 */

• Return value.

/**
 * Function name: fahrenheitToCelsius.
 * @param   fahrenheit (double)
 * @return  celsius   (double) <------
 *
 * Inside the function:
 *  1. return the celsius temperature.   C = (F - 32) * 5/9
 */

Inside the function, use the equation to go from Fahrenheit to Celsius. Then, return the result.

/**
 * Function name: fahrenheitToCelsius.
 * @param   fahrenheit (double)
 * @return  celsius   (double)
 *
 * Inside the function:
 *  1. return the celsius temperature.   C = (F - 32) * 5/9  <----
 */

Task 2 - Write another function

• Function name.

/**
 * Name: printTemperatures  <-----
 * @param fahrenheit (double) 
 *
 * Inside the function:
 *  1. prints the fahrenheit value: "F: <temp in fahrenheit>".
 *  2. calls fahrenheitToCelsius, and
 *     prints the celcius value: "C: <temp in celsius> \n".
 */

• Parameter.

/**
 * Name: printTemperatures
 * @param fahrenheit (double) <-----
 *
 * Inside the function:
 *  1. prints the fahrenheit value: "F: <temp in fahrenheit>".
 *  2. calls fahrenheitToCelsius, and
 *     prints the celcius value: "C: <temp in celsius> \n"..
 */

• Return value: The function is void.

• Code the logic inside the function

/**
 * Name: printTemperatures
 * @param fahrenheit (double)
 *
 * Inside the function:  <-----
 *  1. prints the fahrenheit value: "F: <temp in fahrenheit>".
 *  2. calls fahrenheitToCelsius, and prints the celcius value: "C: <temp in celsius> \n"..
 */

Task 3 - Call the function

From main(), call the printTemperatures function for each value.

Run your code

Visualizing the Runtime

After you solve this workbook, I still recommend watching the video solution on Udemy.

It will show you how to visualize the runtime using Visual Studio Code.

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Associated Course: The Complete Java Development Bootcamp

Related Course: The Complete Spring Boot Development Bootcamp – Become a Java Web Developer