c語言 函數的參數傳遞示例

C ++ isunordered()函數 (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()函數是cmath標頭的庫函數，用于檢查給定值是否無序(如果一個或兩個值均為非數字(NaN)，則它們為無序值)。 它接受兩個值( float ， double或long double )，如果給定的值是無序的，則返回1；否則，返回1。 0，否則。

Syntax of isunordered() function:

isunordered()函數的語法：

In C99, it has been implemented as a macro,

在C99中，它已實現為宏，

    macro isunordered(x, y)

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

在C ++ 11中，它已作為函數實現，

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

Parameter(s):

參數：

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

  x，y –表示要檢查的值是否為無序。

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.

該函數的返回類型為bool ，如果一個或兩個參數均為NaN，則返回1；否則返回0。 0，否則。

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 ++代碼演示isunordered()函數的示例 (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

輸出量

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

參考： C ++ isunordered()函數

翻譯自: https://www.includehelp.com/cpp-tutorial/isunordered-function-with-example.aspx

c語言 函數的參數傳遞示例