安卓log.e函数打印示例_log10（）函数以及C ++中的示例

安卓log.e函数打印示例

C ++ log10()函数 (C++ log10() function)

log10() function is a library function of cmath header, it is used to get the common logarithm (the base-10 logarithm) of the given value. It accepts a value (float, double, or long double) and returns the common logarithm.

log10()函数是cmath标头的库函数，用于获取给定值的常用对数(以10为底的对数)。它接受一个值( float ， double或long double )并返回公共对数。

Syntax of log10() function:

log10()函数的语法：

C++11:

C ++ 11：

     double log10 (double x);
      float log10 (float x);
long double log10 (long double x);
     double log10 (T x);

Parameter(s):

参数：

x – represents the value whose common logarithm to be found.
x –表示要找到其常用对数的值。

Return value:

返回值：

It returns the common logarithm of the given value x.

它返回给定值x的对数。

Note:

注意：

If the given value is negative, it causes a domain error.
如果给定值为负，则将导致域错误。
If the given value is zero, it may cause a pole error.
如果给定值为零，则可能导致极点错误。

Example:

例：

    Input:
    float x = 10.0f
    
    Function call:
    log(x);
    
    Output:
    1

C ++代码演示log10()函数的示例 (C++ code to demonstrate the example of log10() function)

// C++ code to demonstrate the example of
// log10() function

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    float x = 0.0f;

    x = 10.0f;
    cout << "log10(" << x << "): " << log10(x) << endl;

    x = 1.0f;
    cout << "log10(" << x << "): " << log10(x) << endl;

    x = 20.0f;
    cout << "log10(" << x << "): " << log10(x) << endl;

    x = -10.4f;
    cout << "log10(" << x << "): " << log10(x) << endl;

    x = 0.0f;
    cout << "log10(" << x << "): " << log10(x) << endl;

    x = 100.6f;
    cout << "log10(" << x << "): " << log10(x) << endl;

    return 0;
}

Output

输出量

log10(10): 1
log10(1): 0
log10(20): 1.30103
log10(-10.4): nan
log10(0): -inf
log10(100.6): 2.0026

Reference: C++ log10() function

参考： C ++ log10()函数

翻译自: https://www.includehelp.com/cpp-tutorial/log10-function-with-example.aspx

安卓log.e函数打印示例