Java.lang.StrictMath class in Java | Set 1 (original) (raw)

StrictMath Class methods helps to perform the numeric operations like square, square root, cube, cube root, exponential and trigonometric operations

Declaration :

public final class StrictMath extends Object

NaN argument?
A constant holding a Not-a-Number (NaN) value of type double. It is equivalent to the value returned by Double.longBitsToDouble(0x7ff8000000000000L).

Methods of lang.math class :
1. acos() : java.lang.StrictMath.acos() method returns the arc cosine value of the passed argument.
arc cosine is inverse cosine of the argument passed.
acos(arg) = cos-1 of arg

Special Case : Result is NaN, if the argument is NaN or its absolute value is greater than 1.

Syntax:

public static double acos(double a) Parameters: a - the argument whose arc cosine value we need. argument is taken as radian
Returns: arc cosine value of the argument.

2. abs() : java.lang.StrictMath.abs() method returns the absolute value of any type of the argument passed. This method can handle all the data types.

• Result is positive zero, if the argument is positive zero or negative zero.
• Result is positive infinity if the argument is infinite.
• Result is NaN, if passed argument is NaN.

Syntax:

public static datatype abs(datatype arg) Parameters: arg - the argument whose absolute value we need Returns: absolute value of the passed argument.

3. toRadians() : java.lang.StrictMath.toRadians(double deg) method converts argument (degree) to radians.
Note: StrictMath class usually takes radians as an input which is very much different in real life applications since angles is usually represented in degrees.

Syntax:

public static double toRadians(double deg) Parameters: deg - degree angle needs to be in radian. Returns: radians equivalent of the degree-argument passed.

Java code explaining abs(), acos(), toRadians() method in lang.StrictMath class.

Java

import java.lang.*;

public class NewClass

{

`` public static void main(String[] args)

`` {

`` int Vali = - 1 ;

`` float Valf = .5f;

`` System.out.println( "Initial value of int : " + Vali);

`` System.out.println( "Initial value of int : " + Valf);

`` int Absi = StrictMath.abs(Vali);

`` float Absf = StrictMath.abs(Valf);

`` System.out.println( "Absolute value of int : " + Absi);

`` System.out.println( "Absolute value of int : " + Absf);

`` System.out.println( "" );

`` double Acosi = StrictMath.acos( 60 );

`` System.out.println( "acos value of Acosi : " + Acosi);

`` double x = StrictMath.PI;

`` x = StrictMath.toRadians(x);

`` double Acosj = StrictMath.acos(x);

`` System.out.println( "acos value of Acosj : " + Acosj);

`` }

}

Output :

Initial value of int : -1 Initial value of int : 0.5 Absolute value of int : 1 Absolute value of int : 0.5

acos value of Acosi : NaN acos value of Acosj : 1.5159376794536454

4. cbrt() : java.lang.StrictMath.cbrt() method returns the cube root of the passed argument.

Special Point :

• Result is NaN, if the argument is NaN.
• Result is an infinity with the same sign as the argument if the argument is infinite.
• Result is a zero, if the argument is zero.

Syntax:

public static double cbrt(double arg) Parameters: arg - argument passed. Returns: cube root of the argument passed

5. asin() : java.lang.StrictMath.asin() method returns the arc sine value of the method argument passed. Returned angle is in the range -pi/2 to pi/2.
arc sine is inverse sine of the argument passed.
asin(arg) = sine-1 of arg

Special Case :

• Result is NaN, if the argument is NaN or its absolute value is greater than 1.
• Result is a zero, if the argument is zero.

Syntax:

public static double asin(double arg) Parameters: arg - argument passed. Returns: arc sine of the argument passed.

Java code explaining asin(), cbrt() method in lang.StrictMath class.

Java

import java.lang.*;

public class NewClass

{

`` public static void main(String[] args)

`` {

`` int a = 1 , b = 8 ;

`` int radd = a + b;

`` double Asini = StrictMath.asin(radd);

`` System.out.println( "asin value of Asini : " + Asini);

`` double x = StrictMath.PI;

`` x = StrictMath.toRadians(x);

`` double Asinj = StrictMath.asin(x);

`` System.out.println( "asin value of Asinj : " + Asinj);

`` System.out.println( "" );

`` double cbrtval = StrictMath.cbrt( 216 );

`` System.out.println( "cube root : " + cbrtval);

`` }

}

Output :

asin value of Asini : NaN asin value of Asinj : 0.054858647341251204

cube root : 6.0

6. log() : java.lang.StrictMath.log() method returns the logarithmic value of the passed argument.

Syntax: public static double log(double arg) Parameters: arg - argument passed. Returns: logarithmic value of the argument passed.

7. hypot() : java.lang.StrictMath.hypot(double p, double b) method returns hypotenuse of a right triangle on passing the triangle’s base and perpendicular as arguments.
hypotenuse = [perpendicular2 + base2]1/2

Important Point :

• If either argument is infinite, then the result is positive infinity.
• If either argument is NaN and neither argument is infinite, then the result is NaN.

Syntax: public static double hypot(double p, double b) Parameters: p - perpendicular of the right triangle b - base of the right triangle Returns: hypotenuse of the right triangle

8. floor() : java.lang.StrictMath.floor() method returns the floor value of an argument i.e. the closest integer value which is either less or equal to the passed argument.
eg : 101.23 has floor value = 101

Important point : Same argument is resulted if passed an NaN or infinite argument.

Syntax: public static double floor(double arg) Parameters: arg - the argument whose floor value we need **Returns:**closest possible value that is either less than or equal to the argument passed

9. IEEEremainder() : java.lang.StrictMath.IEEERemainder(double d1, double d2) method returns the remainder value by applying remainder operation on two arguments w.r.t IEEE 754 standard.
Remainder value = d1 – d2 * n
where,
n = closest exact value of d1/d2

Syntax: public static double IEEEremainder(double d1, double d2) Parameters: d1 - dividend d2 - divisor Returns: remainder when f1(dividend) is divided by(divisor)

Java code explaining floor(), hypot(), IEEEremainder(), log() method in lang.StrictMath class.

Java

import java.lang.*;

public class NewClass

{

`` public static void main(String[] args)

`` {

`` double f1 = 30.56 , f2 = - 56.34 ;

`` f1 = StrictMath.floor(f1);

`` System.out.println( "Floor value of f1 : " + f1);

`` f2 = StrictMath.floor(f2);

`` System.out.println( "Floor value of f2 : " + f2);

`` System.out.println( "" );

`` double p = 12 , b = - 5 ;

`` double h = StrictMath.hypot(p, b);

`` System.out.println( "Hypotenuse : " +h);

`` System.out.println( "" );

`` double d1 = 105 , d2 = 2 ;

`` double r = StrictMath.IEEEremainder(d1, d2);

`` System.out.println( "Remainder : " + r);

`` System.out.println( "" );

`` double l = 10 ;

`` l = StrictMath.log(l);

`` System.out.println( "Log value of 10 : " + l);

`` }

}

Output :

Floor value of f1 : 30.0 Floor value of f2 : -57.0

Hypotenuse : 13.0

Remainder : 1.0

Log value of 10 : 2.302585092994046

10. ceil() : java.lang.StrictMath.ceil(double a) method returns the smallest possible value which is either greater or equal to the argument passed. The returned value is a mathematical integer.

• Result is same, if the returned value is already a mathematical integer.
• Result is same, if the passed argument is NaN or infinite or zero.
• Result is negative zero, if the passed argument is less than zero but greater than -1.0

Syntax:

public static double ceil(double arg) Parameters: arg - the argument value Returns: smallest possible value(mathematical integer) which is either greater or equal to the argument passed

11. copySign() : java.lang.StrictMath.copySign() method returns first floating-point argument but having the sign of second argument.

Syntax:

public static double copySign(double m, double s) or public static float copySign(float m, float s) Parameters: m - magnitude s - sign Returns: returns second argument with sign of first floating-point argument.

12. atan() : java.lang.StrictMath.atan() method returns returns the arc tangent of the method argument value. The returned angle is in the range -pi/2 through pi/2.
arc tan is inverse tan of the argument passed.
atan(arg) = tan inverse of arg

Special Case :

• Result is NaN, if the passed argument is NaN or its absolute value is > 1.
• Result is zero, if argument is zero.

Syntax:

public static double atan(double a) Parameters: a - the argument whose arc tangent value we need. argument is taken as radian Returns: arc tan value of the argument.

Java code explaining atan(), ceil(), copySign() method in lang.StrictMath class.

Java

import java.math.*;

public class NewClass

{

`` public static void main(String[] args)

`` {

`` double Atani = StrictMath.atan( 0 );

`` System.out.println( "atan value of Atani : " + Atani);

`` double x = StrictMath.PI / 2 ;

`` x = StrictMath.toRadians(x);

`` double Atanj = StrictMath.atan(x);

`` System.out.println( "atan value of Atanj : " + Atanj);

`` System.out.println( "" );

`` double val = 15.34 , ceilval;

`` ceilval = StrictMath.ceil(val);

`` System.out.println( "ceil value of val : " + ceilval);

`` System.out.println( "" );

`` double dblMag = val;

`` double dblSign1 = 3 ;

`` double dblSign2 = - 3 ;

`` double result1 = StrictMath.copySign(dblMag, dblSign1);

`` System.out.println( "copySign1 : " + result1);

`` double result2 = StrictMath.copySign(dblMag, dblSign2);

`` System.out.println( "copySign2 : " + result2);

`` }

}

Output :

atan value of Atani : 0.0 atan value of Atanj : 0.0274087022410345

ceil value of val : 16.0

copySign1 : 15.34 copySign2 : -15.34

Refer more methods of lang.StrictMath class at : JAva.lang.StrictMath class in Java | Set 2