C++中的fabs()

fabs()函数返回参数的绝对值。
数学上| a |。如果a是参数中给出的值。

句法：

double fabs(double a);
float fabs(float a);
int fabs(int a);

Parameter:

The fabs() function takes a single argument, a whose absolute value has to be returned.

Return:

The fabs() function returns the absolute value of the argument.

Error:

It is mandatory to give both the arguments otherwise it will give error
no matching function for call to ‘fabs()’ like this.

＃代码1

// CPP code to illustrate
// fabs() function
#include 
#include 
  
using namespace std;
  
int main()
{
    int a = -10, answer;
  
    answer = fabs(a);
    cout << "fabs of " << a 
         << " is " << answer << endl;
  
    return 0;
}

输出 ：

fabs of -10 is 10

＃代码2

// CPP code to illustrate
// fabs() function
#include 
#include 
  
using namespace std;
  
int main()
{
    long int a = -35;
    double answer;
  
    answer = fabs(a);
    cout << "fabs of " << a << " is " 
         << answer << endl;
  
    return 0;
}

输出 ：

fabs of -35 is 35

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