Java: Accept a float value of number and return a rounded float value

Last update on May 15 2025 13:08:36 (UTC/GMT +8 hours)

Round Float Value

Write a Java program to accept a float value of a number and return a rounded float value.
Sample data:
Input a float number: 12.51
The rounded value of 12.510000 is: 13.00
Input a float number: 12.49999
The rounded value of 12.499990 is: 12.00

Sample Solution:

Java Code:

import java.util.*;
public class Example10 {

 public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input a float number: ");
        float  x = in.nextFloat();  
        System.out.printf("The rounded value of %f is: %.2f",x, round_num(x));
		System.out.printf("\n");
    }

	 public static float round_num(float fn)
	{
		float f_num = (float)Math.floor(fn);
		float c_num = (float)Math.ceil(fn);
		if ((fn - f_num) > (c_num - fn))
			{
				return c_num;
				}
		else if ((c_num - fn) > (fn - f_num)) 
		{
			return f_num;
			}
		else 
		{ 
	       return c_num; 
		   }		
	}
	
	}

Sample Output:

Input a float number: 12.53                                            
The rounded value of 12.530000 is: 13.00    

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to round a float to the nearest integer without using Math.round().
• Write a Java program to implement a custom algorithm that rounds a float based on its fractional part.
• Write a Java program to simulate float rounding by converting it to a string and then truncating the decimal portion.
• Write a Java program to compare the output of a custom rounding function with the built-in rounding method for various float values.

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