Java PiProgramming is used to solve reallife problems that may include implementing different mathematical formulas. And these formulas are used in various mathematical constants and functions. What is Pi?The Pi is a constant value used in different formulas in geometry like calculating circumference, area, volume, etc. It is a mathematical constant that is defined as the circumference of a circle divided by its diameter. The value of a constant pi is approximately 3.14. Java provides builtin constant field of Pi that belong to java.lang,Math class. The following program shows the use of constant value pi without using the builtin constant field. SamplePi.java Output: Radius of circle: 5 Area of circle is: 78.5 Circumference of circle is: 31.400000000000002 In the above code, the pi value is set to 3.14 using a final double variable pi. And the area and circumference are calculated and displayed. Pi in JavaThe Java Math class provides methods for implementing numeric operations like logarithm, square root, trigonometric functions, minimum or maximum number. The pi is a field defined in the Math class as a static variable of type double. To access this constant the Java program has to import java.lang.Math class. As it's a static variable we can directly access it using the Math.PI into the Java program. The following program shows the use of Math.PI variable in a Java program. SamplePi2.java Output: Radius of circle: 5 Area of circle is: 78.53981633974483 Circumference of circle is: 31.41592653589793 In the above code, the Math.PI is used instead of declaring a local variable. And the area and circumference of the circle is displayed on the console. Program for calculating the volume of a cylinder using builtin variable and userdefined variableSamplePi3.java Output: Volume of cylinder by using builtin variable PI is: 1178.0972450961724 Volume of cylinder by using the userdefined Pi value is: 1177.5 The above Java code demonstrates both the ways of using Pi constant in a program. The area of a cylinder is calculated using multiplication operation and displayed using both methods. In this article, we have discussed the mathematical constant Pi, how it can be implemented in a Java program and a program to demonstrate it.
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