c语言 函数的参数传递示例

C ++ scalbln()函数 (C++ scalbln() function)

scalbln() function is a library function of cmath header. It scales the significand using floating-point base exponent (long int) i.e. it is used to calculate the product of the given significand and FLT_RADIX raised to the power of the given exponent. It accepts two parameters significand and exponent and returns the result of significand * FLT_RADIX^exponent.

scalbln()函数是cmath标头的库函数。 它使用浮点基指数(long int)缩放有效位数，即，用于计算给定有效 位数与提高到给定指数幂的 FLT_RADIX的乘积。 它接受两个参数significand和exponent，并返回significand * FLT_RADIX ^指数的结果。

Syntax of scalbln() function:

scalbln()函数的语法：

C++11:

C ++ 11：

     double scalbln (double x     , long int n);
float scalbln (float x      , long int n);
long double scalbln (long double x, long int n);
double scalbln (T x          , long int n);

Parameter(s):

参数：

• x, n – represent the value of significand and exponent.

  x，n –表示有效和指数的值。

Return value:

返回值：

It returns the product of the given significand and FLT_RADIX raised to the power of the given exponent.

它返回给定有效数与FLT_RADIX乘以给定指数幂的乘积。

Example:

例：

    Input:
double x = 10;
long int n = 2;
Function call:
scalbln(x,n);
Output:
40

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

// C++ code to demonstrate the example of
// scalbln() function
#include <iostream>
#include <cmath>
using namespace std;
// main() section
int main()
{
double x;
long int n;
x = 10;
n = 2;
cout << "scalbln(" << x << "," << n << "): " << scalbln(x, n);
cout << endl;
x = 5.3;
n = 2;
cout << "scalbln(" << x << "," << n << "): " << scalbln(x, n);
cout << endl;
x = 15.46;
n = 12.56;
cout << "scalbln(" << x << "," << n << "): " << scalbln(x, n);
cout << endl;
x = -10.2;
n = 2;
cout << "scalbln(" << x << "," << n << "): " << scalbln(x, n);
cout << endl;
return 0;
}

Output

输出量

scalbln(10,2): 40
scalbln(5.3,2): 21.2
scalbln(15.46,12): 63324.2
scalbln(-10.2,2): -40.8

Reference: C++ scalbln() function

参考： C ++ scalbln()函数

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

c语言 函数的参数传递示例