Java Program to Calculate Area and Perimeter of a Square

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

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

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

Find Area of Square in Java

The question is, write a program in Java to find and print area of a square. Following program is its answer:

import java.util.Scanner;

public class fresherearth
{
   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 above Java program with user input 10 as side length of a square whose area we want to see using the program:

Find Perimeter of Square in Java

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

import java.util.Scanner;

public class fresherearth
{
   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 above program with same user input as of previous program, i.e., 10, is:

Calculate Area and Perimeter of Square in Java - Single Program

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

import java.util.Scanner;

public class fresherearth
{
   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 above program with user input 23 as side length of square is shown in the following snapshot:

Note - For Area and Perimeter of 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