Java Math round() Method
The round() method of Java Math class returns a long or an int value that is closest to the argument and is rounded to positive infinity.
Syntax:
- public static int round(float a)
- public static long round(double a)
Parameters:
The parameters ‘a’ represents the floating –point number whose rounded value is to be determined.
Return Value:
The round() method returns the rounded value of the argument to its nearest long or int value.
Special cases are as follows:
- The result is 0, if the argument is NaN.
- The result is Long.MIN_VALUE, if the argument is negative infinity or any value less or equal to Long.MIN_VALUE.
- The result is Long.MAX_VALUE, if the argument is positive infinity or any value greater or equal to Long.MAX_VALUE.
Example 1:
public class JavaMathRoundExample1 {
static int i=1;
//returns the rounded value of the argument to its nearest long
public static void main(String[] args) {
double a=67.4;
double b=67.5;
System.out.println(i++ +". " +Math.round(a));
System.out.println(i+". "+Math.round(b));
}
}
Output:
1. 67 2. 68
Example 2:
public class JavaMathRoundExample2 {
static int i=1;
// result is 0, if the argument is NaN
public static void main(String[] args) {
double a=Double.NaN;
System.out.println(i++ +". " +Math.round(a));
}
}
Output:
1. 0
Example 3:
public class JavaMathRoundExample3 {
static int i=1;
// result is Long.MIN_VALUE, if the argument is negative infinity or any value less or equal to Long.MIN_VALUE.
public static void main(String[] args) {
double a=Double.NEGATIVE_INFINITY;
System.out.println(i++ +". " +Math.round(a));
}
}
Output:
-9223372036854775808
Example 4:
public class JavaMathRoundExample4 {
static int i=1;
//result is Long.MAX_VALUE, if the argument is positive infinity or any value greater or equal to Long.MAX_VALUE.
public static void main(String[] args) {
double a=Double.POSITIVE_INFINITY;
System.out.println(i++ +". " +Math.round(a));
}
}
Output:
9223372036854775807
Example 5:
public class JavaMathRoundExample5 {
static int i=1;
// returns the rounded value of the argument to its nearest int.
public static void main(String[] args) {
float a=0.5f;
System.out.println(i++ +". " +Math.round(a));
}
}
Output:
1