Java - Math round(float x) method

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Description

The java.lang.Math.round(float a) returns the closest int to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result, and casting the result to type int. Special cases −

• If the argument is NaN, the result is 0.

• If the argument is negative infinity or any value less than or equal to the value of Integer.MIN_VALUE, the result is equal to the value of Integer.MIN_VALUE.

• If the argument is positive infinity or any value greater than or equal to the value of Integer.MAX_VALUE, the result is equal to the value of Integer.MAX_VALUE.

Declaration

Following is the declaration for java.lang.Math.round() method

public static int round(float a)

Parameters

a − a floating-point value to be rounded to an integer.

Return Value

This method returns the value of the argument rounded to the nearest int value.

Exception

NA

Example: Getting Round int for a Positive float Value

The following example shows the usage of Math round() method to get a long value for a positive float value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a float number
      float x = 1654.9874f;

      // find the closest long for this float number
      System.out.println("Math.round(" + x + ")=" + Math.round(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.round(1654.9874)=1655

Example: Getting Round int for a Negative float Value

The following example shows the usage of Math round() method to get a long value for a negative float value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a float number
      float x = -9765.134f;

      // find the closest long for this float number
      System.out.println("Math.round(" + x + ")=" + Math.round(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.round(-9765.134)=-9765

Example: Getting Round int for a Zero float Value

The following example shows the usage of Math round() method to get a long value for a zero float values.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get float numbers
      float x = -0.0f;
      float y = 0.0f;	  

      // find the long for these float number
      System.out.println("Math.round(" + x + ")=" + Math.round(x));
	  System.out.println("Math.round(" + y + ")=" + Math.round(y));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.round(-0.0)=0
Math.round(0.0)=0