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 <iostream>
#include <cmath>
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): 0
isunordered(sqrt(-1.0f), sqrt(-2.0f)): 1
isunordered(10.0f, sqrt(-1.0f)): 1
isunordered(sqrt(-1.0f), 1.0f): 1
10,5 are not unordered.
10,-nan are unordered.

Reference: C++ isunordered() function

参考： C ++ isunordered()函数

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

c语言 函数的参数传递示例