JAVAJava中的lang.StrictMath类|集1 更多的java方法。朗:上数学课
13.exp():java。朗,数学。exp(双参数) 方法返回提升为双参数幂的欧拉数。
重要案例:
- 若参数为NaN,则结果为NaN。
- 如果参数为+ve无穷大,则结果为+ve无穷大。
- 如果参数为-ve无穷大,则结果为+ve零。
语法:
public static double exp(double arg)Parameters:arg - argument passed. Returns:Euler’s number raised to the power of passed argument
14.cosh():java。朗,数学。cosh() 方法返回传递的参数的双曲余弦。
特殊情况:
- 若参数为NaN,则结果为NaN。
- 如果参数为零,则结果为1.0。
- 若参数为无穷大,则结果为+ve无穷大。
语法:
public static double cosh(double arg)Parameters:arg - The number whose hyperbolic cosine is to be returned.Returns:the hyperbolic cosine of the argument arg.
15.DecrementAct():java。朗,数学。递减法 方法将传递的参数的值递减1。
语法:
public static int decrementExact(int arg) orpublic static long decrementExact(long arg)Parameters:arg - argument passed. Returns:return argument decremented by one.Throws:Exception if the result overflows long or int datatype, according to theargumented data type.
解释lang.StrictMath类中exp()、DecrementAct()、cosh()方法的Java代码。
JAVA
// Java program explaining lang.StrictMath class methods // exp(), decrementExact(), cosh() import java.math.*; public class NewClass { public static void main(String[] args) { // Use of cosh() method double value = 2 ; double coshValue = StrictMath.cosh(value); System.out.println( "Hyperbolic Cosine of " + coshValue); System.out.println( "" ); // Use of decrementExact() method int result = StrictMath.decrementExact( 3051 ); System.out.println( "Use of decrementExact() : " + result); System.out.println( "" ); // Use of exp() method // declare the exponent to be used double exponent = 34 ; // raise e to exponent declared double expVal = StrictMath.exp(exponent); System.out.println( "Value of exp : " + expVal); } } |
输出:
Using addExact() : 9acos value of Asini : NaNacos value of Asinj : 0.054858647341251204cube root : 6.0
16.log10():java。朗,数学。log10() 方法返回所传递参数的base10对数值。
Syntax:public static double log(double arg)Parameters:arg - argument passed. Returns:base10 logarithmic value of the argument passed.
17.pow():java。朗,数学。战俘(双b,双e) 方法将值返回为 B E
Syntax:public static double pow(double b, double e)Parameters:b : basee : exponent Returns:value as baseexponent
18.incrementExact():java。朗,数学。递增精确() 方法通过递增参数的值来返回参数。
Syntax:public static int incrementExact(int arg) orpublic static long incrementExact(long arg)Parameters:arg - the argumentReturns:incremented value of the argument
解释lang.StrictMath类中incrementExact()、log10()、pow()方法的JAVA代码。
JAVA
// Java program explaining lang.MATH class methods // incrementExact(), log10(), pow() import java.lang.*; public class NewClass { public static void main(String[] args) { // Use of incrementExact() method int f1 = 30 , f2 = - 56 ; f1 = StrictMath.incrementExact(f1); System.out.println( "Incremented value of f1 : " + f1); f2 = StrictMath.incrementExact(f2); System.out.println( "Incremented value of f2 : " + f2); System.out.println( "" ); // Use of log10() method double value = 10 ; double logValue = StrictMath.log10(value); System.out.println( "Log10 value of 10 : " + logValue); System.out.println( "" ); // Use of pow() method double b = 10 , e = 2 ; double power = StrictMath.pow(b, e); System.out.println( "Use of pow() : " + power); } } |
输出:
Incremented value of f1 : 31Incremented value of f2 : -55Log10 value of 10 : 1.0Use of pow() : 100.0
19.signum():java。朗,数学。符号() 方法返回传递的参数的符号值。
-1 if x < 0 signum fun(x) = 0 if x = 0 1 if x > 0
注:
结果为NaN,如果通过,则参数为NaN。
语法:
public static double signum(double x) orpublic static float signum(float x)Parameters:x - the argument whose signum value we needReturns:signum value of x
20.max():java。朗,数学。最大值(双v1,双v2) 方法返回传递的两个参数值中的较大值。 这种方法只使用震级进行比较,不考虑任何符号。
语法:
public static double max(double v1, double v2)Parameters:v1 - first valuev2 - second valueReturns:v1 or v2 based on which number is greater.It can return either of the two if v1 = v2.
21.round():java。朗,数学。第(轮) 方法将传递的参数四舍五入到最接近的小数位数。
注: 如果参数为NaN,则结果为0。
语法:
public static long round(long arg) orpublic static double round(double arg)Parameters:arg - argument needs to round off Returns:round off value of the argument
解释lang.StrictMath类中signum()、round()、max()方法的Java代码。
JAVA
// Java code explaining the lang.StrictMath Class methods // signum(), round(), max() import java.lang.*; public class NewClass { public static void main(String args[]) { // Use of signum() method double x = 10.4556 , y = - 23.34789 ; double signm = StrictMath.signum(x); System.out.println( "Signum of 10.45 = " + signm); signm = StrictMath.signum(y); System.out.println( "Signum of -23.34 = " + signm); System.out.println( "" ); // Use of round() method double r1 = StrictMath.round(x); System.out.println( "Round off 10.4556 = " + r1); double r2 = StrictMath.round(y); System.out.println( "Round off 23.34789 = " + r2); System.out.println( "" ); // Use of max() method on r1 and r2 double m = StrictMath.max(r1, r2); System.out.println( "Max b / w r1 and r2 = " + r2); } } |
输出:
Signum of 10.45 = 1.0Signum of -23.34 = -1.0Round off 10.4556 = 10.0Round off 23.34789 = -23.0Max b/w r1 and r2 = -23.0
22.ulp():java。朗,数学。ulp() 方法返回 最小精度单位(ulp) 即两个浮点数之间的最小距离。 这里,它是参数和下一个较大值之间的最小距离。
语法:
public static double ulp(double arg) orpublic static float ulp(float arg)Parameters:arg - argument passed. Returns:least distance b/w the argument and next larger value.
23.log1p():java。朗,数学。log1p() 方法返回(传递的参数+1)的自然日志。
语法:
public static double log1p(double arg)Parameters:arg - the argumentReturns:log of (argument + 1).This result is within 1 unit in the last place of exact result.
解释lang.StrictMath类中ulp()、log1p()方法的Java代码。
JAVA
// Java code explaining the lang.StrictMath Class methods // ulp(), log1p() import java.lang.*; public class NewClass { public static void main(String args[]) { // Use of ulp() method double x = 34.652 , y = - 23.34789 ; double u = StrictMath.ulp(x); System.out.println( "ulp of 34.652 : " + u); u = StrictMath.ulp(y); System.out.println( "ulp of -23.34789 : " + u); System.out.println( "" ); // Use of log() method double l = 99 ; double l1 = StrictMath.log1p(l); System.out.println( "Log of (1 + 99) : " + l1); l1 = StrictMath.log( 100 ); System.out.println( "Log of 100 : " + l1); } } |
输出:
ulp of 34.652 : 7.105427357601002E-15ulp of -23.34789 : 3.552713678800501E-15Log of (1 + 99) : 4.605170185988092Log of 100 : 4.605170185988092