This article is created to cover a program in Java that calculates the area and perimeter of a square based on the length of its sides as entered by the user at run-time.

Note: The area of a square is calculated using the formula s*s or s². Where s is the length of the side.

Note: The perimeter of a square is calculated using the formula 4*s.

Find the area of a square in Java

The question is: write a program in Java to find and print the area of a square. The following program has its answer:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      float side, area;
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Side Length of Square: ");
      side = s.nextFloat();
      
      area = 4*side;
      System.out.println("\nArea = " +area);
   }
}

The snapshot given below shows the sample run of the above Java program with user input 10 as the side length of a square whose area we want to see using the program:

Find the perimeter of a square in Java

The question is: write a program in Java to find and print the perimeter of a square. The program given below has its answer:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      float s, perimeter;
      Scanner scan = new Scanner(System.in);
      
      System.out.print("Enter the Side Length of Square: ");
      s = scan.nextFloat();
      
      perimeter = 4*s;
      System.out.println("\nPerimeter = " +perimeter);
   }
}

The sample run of the above program with the same user input as the previous program, i.e., 10, is:

Calculate Area and Perimeter of Square in Java: Single Program

After combining both programs given above, this program is created that calculates and prints the area and perimeter values of a square, whose side length is entered by the user at run-time.

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      Scanner scan = new Scanner(System.in);
      
      System.out.print("Enter the Side Length of Square: ");
      float s = scan.nextFloat();
      
      float a = s*s;
      float p = 4*s;
      System.out.println("\nArea = " +a);
      System.out.println("\nPerimeter = " +p);
   }
}

The sample run of the above program with user input 23 as the side length of the square is shown in the following snapshot:

Note: For the area and perimeter of the rectangle program in Java, refer to its separate article.

Same Program in Other Languages

• Calculate Area & Perimeter of a Square in C
• Calculate Area & Perimeter of a Square in C++
• Calculate Area of a Square in Python
• Calculate Perimeter of a Square in Python

Java Online Test

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