What does PI mean in java?

PI in Java stands for pi, which is used to calculate the circumference and area of ​​a circle, trigonometric functions, probability and statistics. Access PI constants through the PI field of the java.lang.Math class.

PI stands for: pi in Java

PI is the constant of pi, which represents the circumference of a circle and diameter ratio. In the Java programming language, PI constants can be accessed through the PI field of the java.lang.Math class.

Some common uses of PI in Java include:

• Calculate the circumference and area of ​​a circle: Calculate the circumference of a circle using PI (circumference = 2 PI radius) and area (area = PI * radius²).
• Trigonometric functions: PI constants are used to calculate trigonometric functions such as sine, cosine and tangent.
• Probability and Statistics: PI is used in probability and statistics to calculate the probability density function of the normal distribution, chi-square distribution, and other distributions.

Syntax for accessing PI constants:

double pi = Math.PI;

Example:

Calculate the circumference of a circle with a radius of 5:

double radius = 5;
double circumference = 2 * Math.PI * radius;
System.out.println("圆周长：" + circumference);

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