在 Java 中计算对数

Java 9月前 227

本教程将演示如何使用 Math.log 函数在 Java 中计算对数。

在 Java 中使用 `Math.log` 计算给定值的对数

在 Java 中，java.lang.Math 库具有函数 Math.log() 来计算给定值的对数。输入值可以是双精度、整数或浮点数，并返回双精度值。

我们必须确保数字不是负数、零或无穷大；否则，输出将不是双精度数据类型。

下面的例子展示了 Java 中 Math.log 的使用。

import java.lang.Math;
class Java_Log {
    public static void main(String args[])
    {
        double p = -4.3;
        double q = 6.0 / 0;
        double r = 0;
        double s = 130.333;
        double u = 130.333/30;
        int v = 5;
        float w = 34;
        // The negative double in the Math.log function will output: NaN
        System.out.println("The Output for Negative Integer:");
        System.out.println(Math.log(p));
        // The positive infinity in the Math.log function will output: Infinity
        System.out.println("The Output for Positive Infinity:");
        System.out.println(Math.log(q));
        // The positive zero in the Math.log function will output: - Infinity
        System.out.println("The Output for Zero:");
        System.out.println(Math.log(r));
        //The positive double argument in the Math.log function will output: logarithm answer
        System.out.println("The Output for positive double:");
        System.out.println(Math.log(s));
        //The positive double argument in the Math.log function will output: logarithm answer
        System.out.println("The Output for Positive double in division form:");
        System.out.println(Math.log(u));
        //The positive integer argument in the Math.log function will output: logarithm answer
        System.out.println("The Output for Positive Integer:");
        System.out.println(Math.log(v));
        //The positive integer float argument in the Math.log function will output: logarithm answer
        System.out.println("The Output for Positive float:");
        System.out.println(Math.log(w));
    }
}

输出：

The Output for Negative Integer:
NaN
The Output for Positive Infinity:
Infinity
The Output for Zero:
-Infinity
The Output for positive double:
4.870092713769228
The Output for Positive double in division form:
1.468895332107073
The Output for Positive Integer:
1.6094379124341003
The Output for Positive float:
3.5263605246161616