c语言函数的参数传递示例_C ++中带有示例的nearint（）函数

c语言函数的参数传递示例

C ++附近的int()函数 (C++ nearbyint() function)

nearbyint() function is a library function of cmath header, it is used to round the given value to an integral value based on the specified direction by fegetround() function. It accepts a value and returns the rounded integral value.

nearint()函数是cmath标头的库函数，用于通过fegetround()函数根据指定方向将给定值舍入为整数值。它接受一个值并返回四舍五入的整数值。

Syntax of nearbyint() function:

附近的int()函数的语法：

C++11:

C ++ 11：

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

Parameter(s):

参数：

x – represents the value to round.
x –表示要取整的值。

Return value:

返回值：

It returns value rounded to nearby integral.

它返回四舍五入到附近整数的值。

Example:

例：

    Input:
double x = 123.4;
Function call:
nearbyint(x);
Output:
123
Input:
double x = 123.5;
Function call:
nearbyint(x);
Output:
124

C ++代码来演示Nearestint()函数的示例 (C++ code to demonstrate the example of nearbyint() function)

// C++ code to demonstrate the example of
// nearbyint() function
#include <iostream>
#include <cmath>
#include <fenv.h> // for fegetround()
using namespace std;
int main()
{
double x = 0.0;
cout << "Specified rounding is: ";
switch (fegetround()) {
case FE_DOWNWARD:
cout << "Downward" << endl;
break;
case FE_TONEAREST:
cout << "To-nearest" << endl;
break;
case FE_TOWARDZERO:
cout << "Toward-zero" << endl;
break;
case FE_UPWARD:
cout << "Upward" << endl;
break;
default:
cout << "Unknown" << endl;
}
x = 123.4;
cout << "nearbyint(" << x << "): " << nearbyint(x) << endl;
x = 123.5;
cout << "nearbyint(" << x << "): " << nearbyint(x) << endl;
x = 123.6;
cout << "nearbyint(" << x << "): " << nearbyint(x) << endl;
x = -123.4;
cout << "nearbyint(" << x << "): " << nearbyint(x) << endl;
x = -123.5;
cout << "nearbyint(" << x << "): " << nearbyint(x) << endl;
x = -123.6;
cout << "nearbyint(" << x << "): " << nearbyint(x) << endl;
return 0;
}

Output

输出量

Specified rounding is: To-nearest
nearbyint(123.4): 123
nearbyint(123.5): 124
nearbyint(123.6): 124
nearbyint(-123.4): -123
nearbyint(-123.5): -124
nearbyint(-123.6): -124

Reference: C++ nearbyint() function

参考： C ++附近的int()函数