Java: Test two floating-point numbers are same upto three decimal places

Last update on May 14 2025 13:01:09 (UTC/GMT +8 hours)

Compare Floats Up to Three Decimals

Write a Java program that reads two floating-point numbers and tests whether they are the same up to three decimal places.

Test Data
Input floating-point number: 25.586
Input floating-point another number: 25.589

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise6 {

    
  public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);

        System.out.print("Input floating-point number: ");
        double x = in.nextDouble();
        System.out.print("Input floating-point another number: ");
        double y = in.nextDouble();

        x = Math.round(x * 1000);
        x = x / 1000;

        y = Math.round(y * 1000);
        y = y / 1000;

        if (x == y)
        {
            System.out.println("They are the same up to three decimal places");
        }
        else
        {
            System.out.println("They are different");
        }
    }
}

Sample Output:

Input floating-point number:  25.586
Input floating-point another number:  25.589
They are different

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to compare two float values for equality up to three decimal places using BigDecimal.
• Write a Java program to truncate two floating-point numbers to three decimals and then compare them for equality.
• Write a Java program to check near-equality of floats using an epsilon value of 0.001 and output a detailed message.
• Write a Java program to compare two floats by formatting them with String.format("%.3f") before the comparison.

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