Java Math rint
rint() returns double value that is closest in value to the argument and is equal to a mathematical integer.
Following is the syntax of rint() method.
double result = rint(double a)
Since the definition of rint() function has double datatype as argument, you can pass int, float or long as arguments; because these datatypes could implicitly promote to double.
We shall learn about some of the special cases for rint() method with examples.
Example 1 Mathrintdouble
In the following example, we use rint() method to find the closest double value to the argument, and also equal to a mathematical integer.
Java Program
public class MathExample {
public static void main(String[] args) {
double a = 25.63;
double result = Math.rint(a);
System.out.println(result);
}
}
Output
26.0
Example 2 Mathrintfloat
In the following example, we pass an float value as argument to rint() method.
Java Program
public class MathExample {
public static void main(String[] args) {
float a = 25.12635F;
double result = Math.rint(a);
System.out.println(result);
}
}
Output
25.0
Example 3 Mathrint Argument is NaN, Positive Infinity or Negative Infinity
If the argument to rint() is NaN, Positive Infinity or Negative Infinity, then the return value would be same as that of the argument.
Java Program
public class MathExample {
public static void main(String[] args) {
System.out.println(Math.rint(Double.NaN));
System.out.println(Math.rint(Double.POSITIVE_INFINITY));
System.out.println(Math.rint(Double.NEGATIVE_INFINITY));
}
}
Output
NaN Infinity -Infinity
Conclusion
In this Java Tutorial, we learned about Java Math.rint() function, with example programs.