How to use the PI number in Java
problem
You would like to use the Mathematically π (in English “pi”) number in your program. The constant: 3.1415… It can be used in lots of areas like calculating:
- the circumference or area of a Circle
- The surface area or volume of a sphere
- And more
In this post we will see how to use it.
SOLUTION
Java is equipped with the Math class that has the constant PI defined for us. This class is in the java.lang package so we can directly use it in our code, for example:
System.out.println(Math.PI);
output
We can also define it as constant in our program by using a constant variable (that we can’t change its value later on). For example:
final double PI = 3.14;
System.out.println(PI);
running
Let’s create a class and a main method so it’s runnable.
public class PiExample {
public static void main(String[] args) {
final double PI = 3.14;
System.out.println(PI);
}
}
output
conclusion
Comparing the two examples we saw, of course it’s better to use the already defined Math.PI constant instead of re declaring our own variable. It has better accuracy too. Moreover, it was created by experts.
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Ellion
Professional IT consultant, writer, programmer enthusiast interested in all sorts of coding.
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