Question

Unit 5: Discussion - Part 1

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Question

Read the lecture for Chapter 5 and then answer the following:.

Among other topics, this week's lecture covered Application Programming Interface (API) and Wrapper classes. This discussion thread will require material from both of them. Show syntactically correct Java code that requests at least one number from the user. The program will store all the numbers the user provides into separate String variables, and it will use the appropriate methods from the wrapper classes to convert these Strings into numerical values. Afterwards, the program should use these numerical values to compute any mathematical formula that uses at least one method from the Math class and display the outcome with appropriate titles. Show also a screen capture with a sample input/output session of your program.

Hint: Figure 5.3 from the textbook shows an example that is similar to what is requested here. The only difference is that, in the textbook, figure 5.3 reads the base of the triangle using the nextDouble method. However, in this discussion thread, you must use the nextLine method to read the user input into a String and then use the wrapper class parseDouble to convert the String into a double. Like this:

      Scanner stdIn = new Scanner(System.in);

    String baseStr;
    double base;

    System.out.print("Enter the Width of the Square: ");
    baseStr = stdIn.nextLine();
    base = Double.parseDouble(baseStr);

Come up with a similar example of your own.

Answer 1

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

import java.util.Scanner;
class Main
{
   public static void main (String[] args)
   {
   //take the scanner
   Scanner sc=new Scanner(System.in);
  
   // we will calculate the circumference and area of the circle
       System.out.print("Enter Radius of the Circle: ");
       String radiusStr = sc.nextLine(); // read as string
      
       //parse it here with a (WRAPPER)
       Integer radius = Integer.parseInt(radiusStr);
      
       // Calculate the circumference and area
       // area = PI * r^2
       double area = Math.PI * Math.pow(radius,2);
       double circumference = 2 * Math.PI * radius;
      
       System.out.println("Area: "+area);
       System.out.println("circumference: "+circumference);
      
   }
}

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SCREENSHOT: