python中modf_C ++中带有示例的modf（）函数

清疚 2023-03-05 12:44 134阅读 0赞

python中modf

## C ++ modf()函数 **(**C++ modf() function**)** ##

**modf() function** is a library function of **cmath** header, it is used to get the fractional and integral parts of the given number. It accepts two arguments, the first argument is the value (float, double, or long double), and the second argument is a pointer to store an integral part, and it returns the fractional part and assigns an integral part in the pointer assigned as the second argument.

**modf()函数**是**cmath**标头的库函数，用于获取给定数字的小数和整数部分。 它接受两个参数，第一个参数是值( float ， double或long double )，第二个参数是存储整数部分的指针，并返回小数部分并在分配为的指针中分配整数部分第二个论点。

**Syntax of modf() function:**

**modf()函数的语法：**

C++11:

C ++ 11：

double modf (double x, double* integral_part);
          float modf (float x, float* integral_part);
    long double modf (long double x, long double* integral_part);
         double modf (T x, double* integral_part);

**Parameter(s):**

**参数：**

*  x, integral\_part – x represents the value to break into the fractional and integral part, integral\_part represents the pointer to store an integral part.
    
    x，integral\_part – x表示要分成小数和整数部分的值， integrate\_part表示存储整数部分的指针。

**Return value:**

**返回值：**

It returns the fractional part of the given value x.

它返回给定值x的小数部分。

**Example:**

**例：**

Input:
        float x = 123.456f;
        float fpart = 0.0f;
        float ipart = 0.0f;
        
        Function call:
        fpart = modf(x, &ipart);
        
        Output:
        ipart = 123
        fpart = 0.456001

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

// C++ code to demonstrate the example of
    // modf() function
    
    #include <iostream>
    #include <cmath>
    using namespace std;
    
    int main()
    {
        float value = 0.0f;
        float fpart = 0.0f;
        float ipart = 0.0f;
    
        value = 123.456f;
        fpart = modf(value, &ipart);
        cout << "value: " << value << endl;
        cout << "fpart: " << fpart << endl;
        cout << "ipart: " << ipart << endl;
        cout << endl;
    
        value = 123.0f;
        fpart = modf(value, &ipart);
        cout << "value: " << value << endl;
        cout << "fpart: " << fpart << endl;
        cout << "ipart: " << ipart << endl;
        cout << endl;
    
        value = 0.123f;
        fpart = modf(value, &ipart);
        cout << "value: " << value << endl;
        cout << "fpart: " << fpart << endl;
        cout << "ipart: " << ipart << endl;
        cout << endl;
    
        value = -123.456f;
        fpart = modf(value, &ipart);
        cout << "value: " << value << endl;
        cout << "fpart: " << fpart << endl;
        cout << "ipart: " << ipart << endl;
        cout << endl;
    
        return 0;
    }

**Output**

**输出量**

value: 123.456
    fpart: 0.456001
    ipart: 123
    
    value: 123
    fpart: 0
    ipart: 123
    
    value: 0.123
    fpart: 0.123
    ipart: 0
    
    value: -123.456
    fpart: -0.456001
    ipart: -123

Reference: [C++ modf() function][C_ modf_ function]

参考： [C ++ modf()函数][C_ modf_ function]

> 翻译自: [https://www.includehelp.com/cpp-tutorial/modf-function-with-example.aspx][https_www.includehelp.com_cpp-tutorial_modf-function-with-example.aspx]

python中modf

[C_ modf_ function]: http://www.cplusplus.com/reference/cmath/modf/
[https_www.includehelp.com_cpp-tutorial_modf-function-with-example.aspx]: https://www.includehelp.com/cpp-tutorial/modf-function-with-example.aspx