Java Math class
In java, there is a rich
set of mathematical methods/functions provided in the Java Math class. Some of common
math method of Java are sqrt(), pow(), min), max(), floor(), round(), ceil(),
random() etc. some of method or function called automatically by default.
In the following program
I have provided some of the common Java Math class methods with comments and
outputs.
public class
MathLibraryExample
{
public static void main(String[] args)
{
double rint;
double x = 72.5;
double y = 79.7;
int i, j;
double a, b, c, num;
a = 5.2;
b = 5.9;
c = -5;
System.out.println("Math Function
in Java");
System.out.println("=====================");
// Math.abs() will return absolute value(without any sign)
System.out.println(c + " Absolute
value is " + Math.abs(c));
/*
Math.round() method returns the value in rounded form.
It will return the same value if the
number is
below ½ or .5 otherwise it return the
next higher integer value.
*/
System.out.println(x + " is
approximately " + Math.round(x));
System.out.println(y + " is
approximately " + Math.round(y));
/*The Math.ceil() return the rounded
value to the
* next higher integer and it return
double type value */
System.out.println("The ceiling of
" + a + " is " + Math.ceil(a));
System.out.println("The ceiling of
" + b + " is " + Math.ceil(b));
System.out.println("The ceiling of
" + x + " is " + Math.ceil(x));
System.out.println("The ceiling of
" + y + " is " + Math.ceil(y));
// Math.floor() returns a number down to the nearest integer
// it can round off a floating point
number
System.out.println("The floor of
" + a + " is " + Math.floor(a));
System.out.println("The floor of
" + b + " is " + Math.floor(b));
System.out.println("The floor of
" + x + " is " + Math.floor(x));
System.out.println("The floor of
" + y + " is " + Math.floor(y));
// Math.rint() will returns the
truncated value of the given number
// that is, the integer part of the
value by removing fractional part
rint = 7.26;
System.out.println("The rint of
" + rint + " is " + Math.rint(rint));
rint = 7.84;
System.out.println("The rint of
" + rint + " is " + Math.rint(rint));
// Comparison operators
// min() returns the smaller of the two
numbers.
// The value return's depending upon
the number used as the
// arguments to the method
System.out.println("min(" + a
+ "," + b + ") is " + Math.min(a,b));
System.out.println("min(" + x
+ "," + y + ") is " + Math.min(x,y));
System.out.println("min(" + a
+ "," + b + ") is " + Math.min(a,b));
System.out.println("min(" + y
+ "," + b + ") is " + Math.min(y,b));
// There's a corresponding max() method
// that returns the larger of two
numbers
// The value return's depending upon
the number used as the
// arguments to the method
System.out.println("max(" + a
+ "," + b + ") is " + Math.max(a,b));
System.out.println("max(" + x
+ "," + y + ") is " + Math.max(x,y));
System.out.println("max(" + a
+ "," + x + ") is " + Math.max(a,x));
System.out.println("max(" + a +
"," + b + ") is " + Math.max(a,b));
// The Math library Math.PI and Math.E defines
// constant value
System.out.println("Pi value is
" + Math.PI);
System.out.println("e value is
" + Math.E);
// Trigonometric methods in Java
// The arguments / parameters are given
in radians
// radiant = (22/(7*180))*Degree
// Convert a 30 degree angle to radians
double angle = 30.0 * 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 radians = 1.5d;
double sine = Math.sin(radians);
double cosine = Math.cos(radians);
double tan = Math.tan(radians);
double asine = Math.asin(sine);
double acosine = Math.acos(cosine);
double atan = Math.atan(tan);
System.out.println("The value Sine
of " + radians + " =
" + sine);
System.out.println("The value
Cosine of " + radians + " =
" + cosine);
System.out.println("The value
Tangent of " + radians + " =
" + tan);
System.out.println("The value
Arcsine of " + sine + " =
" + asine);
System.out.println("The value
Arccosine of " + cosine + " =
" + acosine);
System.out.println("The value
Arctangent of " + tan + " = " + atan);
// Exponential and Logarithmic Methods in java
// Math.exp(2.0) returns e
(7.38905609893065) raised
// to the power of a.
System.out.println("exp(2.0) is
" + Math.exp(2.0));
System.out.println("exp(10.0) is
" + Math.exp(10.0));
System.out.println("exp(0.0) is
" + Math.exp(0.0));
// Math.log(a) returns the natural
// logarithm (base e) of a.
System.out.println("log(2.0) 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));
// math.pow() method in java
// Math.pow(x, y) returns the x raised
// to the yth power.
System.out.println("pow(10, 3) is
" + Math.pow(10,3));
System.out.println("pow(5.0, 4.5)
is " + Math.pow(5.0,4.5));
System.out.println("pow(10, -1) is
" + Math.pow(10,-1));
// Math.sqrt(num) returns the square root of num
num = 25;
System.out.println("The square
root of " + num + " is "
+ Math.sqrt(num));
// Math.cbrt() return the cube root of
number
num = 125;
System.out.println("The cube root
of " + num + " is " +
Math.cbrt(num));
// Random method Math.random() in java
// will return pseudo-random number between 0.0 and 1.0;
System.out.println("Random number genetated : " + Math.random());
System.out.println("Here's 5
random number is: " + Math.random()*5);
}
}
Output
Math Function in Java
=====================
-5.0 Absolute value is
72.5
72.5 is approximately 73
79.7 is approximately 80
The ceiling of 5.2 is
6.0
The ceiling of 5.9 is
6.0
The ceiling of 72.5 is
73.0
The ceiling of 79.7 is
80.0
The floor of 5.2 is 5.0
The floor of 5.9 is 5.0
The floor of 72.5 is
72.0
The floor of 79.7 is
79.0
The rint of 7.26 is 7.0
The rint of 7.84 is 8.0
min(5.2,5.9) is 5.2
min(72.5,79.7) is 72.5
min(5.2,5.9) is 5.2
min(79.7,5.9) is 5.9
max(5.2,5.9) is 5.9
max(72.5,79.7) is 79.7
max(5.2,72.5) is 72.5
max(5.2,5.9) is 5.9
Pi value is
3.141592653589793
e value is
2.718281828459045
cos(0.5235987755982988)
is 0.8660254037844387
sin(0.5235987755982988)
is 0.49999999999999994
The value Sine of 1.5 = 0.9974949866040544
The value Cosine of 1.5 = 0.0707372016677029
The value Tangent
of 1.5 = 14.101419947171719
The value Arcsine
of 0.9974949866040544 =
1.5000000000000002
The value Arccosine
of 0.0707372016677029 = 1.5
The value Arctangent of
14.101419947171719 = 1.5
exp(2.0) is
7.38905609893065
exp(10.0) is
22026.465794806718
exp(0.0) is 1.0
log(2.0) is 0.0
log(10.0) is
2.302585092994046
log(Math.E) is 1.0
pow(10, 3) is 1000.0
pow(5.0, 4.5) is
1397.5424859373686
pow(10, -1) is 0.1
The square root of 25.0
is 5.0
The cube root of 125.0
is 5.0
Random number
genetated : 0.2738161073495178
Here's 5 random number
is: 2.1900603338270512
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