c语言 函数的参数传递示例

C ++ isunordered()函数 (C++ isunordered() function)

isunordered() function is a library function of cmath header, it is used to check whether the given values are unordered (if one or both values are Not-A-Number (NaN)), then they are unordered values). It accepts two values (float, double or long double) and returns 1 if the given values are unordered; 0, otherwise.

isunordered()函数是cmath标头的库函数，用于检查给定值是否无序(如果一个或两个值均为非数字(NaN)，则它们为无序值)。 它接受两个值( float ， double或long double )，如果给定的值是无序的，则返回1；否则，返回1。 0，否则。

Syntax of isunordered() function:

isunordered()函数的语法：

In C99, it has been implemented as a macro,

在C99中，它已实现为宏，

macro isunordered(x, y)

In C++11, it has been implemented as a function,

在C ++ 11中，它已作为函数实现，

bool isunordered (float x, float y);    bool isunordered (double x, double y);    bool isunordered (long double x, long double y);

Parameter(s):

参数：

• x, y – represent the values to be checked as unordered.

  x，y –表示要检查的值是否为无序。

Return value:

返回值：

The returns type of this function is bool, it returns 1 if one or both arguments are NaN; 0, otherwise.

该函数的返回类型为bool ，如果一个或两个参数均为NaN，则返回1；否则返回0。 0，否则。

Example:

例：

Input:    float x = sqrt(-1.0f);    float y = 10.0f;        Function call:    isunordered(x, y);        Output:    1    Input:    float x = 1.0f;    float y = 10.0f;    Function call:    isunordered(x, y);        Output:    0

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

// C++ code to demonstrate the example of// isunordered() function#include 
    
     #include 
     
      using namespace std;int main(){
       cout << "isunordered(-5.0f, -2.0f): " << isunordered(-5.0f, -2.0f) << endl;    cout << "isunordered(sqrt(-1.0f), sqrt(-2.0f)): " << isunordered(sqrt(-1.0f), sqrt(-2.0f)) << endl;    cout << "isunordered(10.0f, sqrt(-1.0f)): " << isunordered(10.0f, sqrt(-1.0f)) << endl;    cout << "isunordered(sqrt(-1.0f), 1.0f): " << isunordered(sqrt(-1.0f), 1.0f) << endl;    float x = 10.0f;    float y = 5.0f;    // checking using the condition    if (isunordered(x, y)) {
           cout << x << "," << y << " are unordered." << endl;    }    else {
           cout << x << "," << y << " are not unordered." << endl;    }    x = 10.0f;    y = sqrt(-1.0f);    if (isunordered(x, y)) {
           cout << x << "," << y << " are unordered." << endl;    }    else {
           cout << x << "," << y << " are unordered." << endl;    }    return 0;}
     
    

Output

输出量

isunordered(-5.0f, -2.0f): 0isunordered(sqrt(-1.0f), sqrt(-2.0f)): 1isunordered(10.0f, sqrt(-1.0f)): 1isunordered(sqrt(-1.0f), 1.0f): 110,5 are not unordered.10,-nan are unordered.

Reference:

参考：

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c语言 函数的参数传递示例