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); System.out.println("x is " + x); System.out.println("y is " + y);
// 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("|" + j + "| is " + Math.abs(j)); System.out.println("|" + x + "| is " + Math.abs(x)); 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 " + i + " is " + Math.ceil(i)); System.out.println("The ceiling of " + j + " is " + Math.ceil(j)); 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 " + i + " is " + Math.floor(i)); System.out.println("The floor of " + j + " is " + Math.floor(j)); 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)); System.out.println("min(" + i + "," + x + ") is " + Math.min(i,x)); System.out.println("min(" + y + "," + j + ") is " + Math.min(y,j));
// 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)); System.out.println("max(" + i + "," + x + ") is " + Math.max(i,x)); System.out.println("max(" + y + "," + j + ") is " + Math.max(y,j));
// 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()); System.out.println("Here's another random number: " + Math.random());
} }
OUTPUT
i is 7 j is -9 x is 72.3 y is 0.34 |7| is 7 |-9| is 9 |72.3| is 72.3 |0.34| is 0.34 72.3 is approximately 72 0.34 is approximately 0 The ceiling of 7 is 7.0 The ceiling of -9 is -9.0 The ceiling of 72.3 is 73.0 The ceiling of 0.34 is 1.0 The floor of 7 is 7.0 The floor of -9 is -9.0 The floor of 72.3 is 72.0 The floor of 0.34 is 0.0 min(7,-9) is -9 min(72.3,0.34) is 0.34 min(7,72.3) is 7.0 min(0.34,-9) is -9.0 max(7,-9) is 7 max(72.3,0.34) is 72.3 max(7,72.3) is 72.3 max(0.34,-9) is 0.34 Pi is 3.141592653589793 e is 2.718281828459045 cos(0.7853981633974483) is 0.7071067811865476 sin(0.7853981633974483) is 0.7071067811865475 acos(0.707) is 0.7855491633997437 asin(0.707) is 0.785247163395153 atan(0.707) is 0.6154085176292563 exp(1.0) is 2.7182818284590455 exp(10.0) is 22026.465794806718 exp(0.0) is 1.0 log(1.0) is 0.0 log(10.0) is 2.302585092994046 log(Math.E) is 1.0 pow(2.0, 2.0) is 4.0 pow(10.0, 3.5) is 3162.2776601683795 pow(8, -1) is 0.125 The square root of 0 is 0.0 The square root of 1 is 1.0 The square root of 2 is 1.4142135623730951 The square root of 3 is 1.7320508075688772 The square root of 4 is 2.0 The square root of 5 is 2.23606797749979 The square root of 6 is 2.449489742783178 The square root of 7 is 2.6457513110645907 The square root of 8 is 2.8284271247461903 The square root of 9 is 3.0 Here's one random number: 0.7496372343000587 Here's another random number: 0.0943150671565458
//Rounding JDK 1.1
import java.math.*;
/** * * @author pentax */ public class TestRound11 {
public static void main(String args[]) { double d = 3.1537; BigDecimal bd = new BigDecimal(d); bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP); // output is 3.15 System.out.println(d + " : " + round(d, 2)); // output is 3.154 System.out.println(d + " : " + round(d, 3)); }
public static double round(double d, int decimalPlace) { // see the Javadoc about why we use a String in the constructor // http://java.sun.com/j2se/1.5.0/docs/api/java/math/BigDecimal.html#BigDecimal(double) BigDecimal bd = new BigDecimal(Double.toString(d)); bd = bd.setScale(decimalPlace, BigDecimal.ROUND_HALF_UP); return bd.doubleValue(); } }
OUTPUT 3.1537 : 3.15 3.1537 : 3.154
JDK 1.0.2 /* * To change this template, choose Tools | Templates * and open the template in the editor. */
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