MathLibraryExample.java

// Java Program to demonstrate the 
// Use of Math Class 
public class MathLibraryExample { 
	public static void main(String[] args) 
	{ 
		int i = 7; 
		int j = -9; 
		double x = 72.3; 
		double y = 0.34; 

		System.out.println("i is " + i); 
		System.out.println("j is " + j); 

		// The absolute value of a number is equal to the 
		// number if the number is positive or zero and 
		// equal to the negative of the number if the number 
		// is negative. 

		System.out.println("|" + i + "| is " + Math.abs(i)); 
		System.out.println("|" + y + "| is " + Math.abs(y)); 

		// Truncating and Rounding functions 
		// You can round off a floating point number to the 
		// nearest integer with round() 
		System.out.println(x + " is approximately "
						+ Math.round(x)); 
		System.out.println(y + " is approximately "
						+ Math.round(y)); 

		// The "ceiling" of a number is the smallest integer 
		// greater than or equal to the number. Every 
		// integer is its own //ceiling. 
		System.out.println("The ceiling of " + x + " is "
						+ Math.ceil(x)); 
		System.out.println("The ceiling of " + y + " is "
						+ Math.ceil(y)); 

		// The "floor" of a number is the largest integer 
		// less than or equal to the number. Every integer 
		// is its own floor. 
		System.out.println("The floor of " + x + " is "
						+ Math.floor(x)); 
		System.out.println("The floor of " + y + " is "
						+ Math.floor(y)); 

		// Comparison operators 

		// min() returns the smaller of the two arguments 
		// you pass it 
		System.out.println("min(" + i + "," + j + ") is "
						+ Math.min(i, j)); 
		System.out.println("min(" + x + "," + y + ") is "
						+ Math.min(x, y)); 

		// There's a corresponding max() method 
		// that returns the larger of two numbers 
		System.out.println("max(" + i + "," + j + ") is "
						+ Math.max(i, j)); 
		System.out.println("max(" + x + "," + y + ") is "
						+ Math.max(x, y)); 

		// The Math library defines a couple of useful 
		// constants: 
		System.out.println("Pi is " + Math.PI); 
		System.out.println("e is " + Math.E); 

		// Trigonometric methods. All arguments are given in 
		// radians 
		// Convert a 45 degree angle to radians 
		double angle = 45.0 * 2.0 * Math.PI / 360.0; 
		System.out.println("cos(" + angle + ") is "
						+ Math.cos(angle)); 
		System.out.println("sin(" + angle + ") is "
						+ Math.sin(angle)); 

		// Inverse Trigonometric methods. All values are 
		// returned as radians 

		double value = 0.707; 

		System.out.println("acos(" + value + ") is "
						+ Math.acos(value)); 
		System.out.println("asin(" + value + ") is "
						+ Math.asin(value)); 
		System.out.println("atan(" + value + ") is "
						+ Math.atan(value)); 

		// Exponential and Logarithmic Methods 

		// exp(a) returns e (2.71828...) raised 
		// to the power of a. 
		System.out.println("exp(1.0) is " + Math.exp(1.0)); 
		System.out.println("exp(10.0) is "
						+ Math.exp(10.0)); 
		System.out.println("exp(0.0) is " + Math.exp(0.0)); 

		// log(a) returns the natural 
		// logarithm (base e) of a. 
		System.out.println("log(1.0) is " + Math.log(1.0)); 
		System.out.println("log(10.0) is "
						+ Math.log(10.0)); 
		System.out.println("log(Math.E) is "
						+ Math.log(Math.E)); 

		// pow(x, y) returns the x raised 
		// to the yth power. 
		System.out.println("pow(2.0, 2.0) is "
						+ Math.pow(2.0, 2.0)); 
		System.out.println("pow(10.0, 3.5) is "
						+ Math.pow(10.0, 3.5)); 
		System.out.println("pow(8, -1) is "
						+ Math.pow(8, -1)); 

		// sqrt(x) returns the square root of x. 
		for (i = 0; i < 10; i++) { 
			System.out.println("The square root of " + i 
							+ " is " + Math.sqrt(i)); 
		} 

		// Finally there's one Random method 
		// that returns a pseudo-random number 
		// between 0.0 and 1.0; 

		System.out.println("Here's one random number: "
						+ Math.random()); 
	} 
}