Java: Round a float number to specified decimals

Last update on May 15 2025 13:09:20 (UTC/GMT +8 hours)

Round Float to Specified Decimals

Write a Java program to round a float number to specified decimals.

Sample Solution:

Java Code:

import java.lang.*;
import java.math.BigDecimal;
public class Example4 {
 public static void main(String[] args) {
        float x = 451.3256412f;
        BigDecimal result;
		int decimal_place = 4;
		BigDecimal bd_num = new BigDecimal(Float.toString(x));
        bd_num = bd_num.setScale(decimal_place, BigDecimal.ROUND_HALF_UP); 
		System.out.printf("Original number: %.7f\n",x);
        System.out.println("Rounded upto 4 decimal: "+bd_num);
  }
}

Sample Output:

Original number: 451.3256531                                           
Rounded upto 4 decimal: 451.3257

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to round a float to n decimal places without using built-in rounding methods.
• Write a Java program to implement custom rounding logic for floats using string manipulation.
• Write a Java program to compare rounding of floats to specified decimals using BigDecimal versus manual calculation.
• Write a Java program to round a float value using recursive division and modulus operations.

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