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abs函数

原型:

   double abs (double x);
      float abs (float x);
long double abs (long double x);
     double abs (T x);           // additional overloads for integral types
代码:

// cmath‘s abs example
#include <iostream>     // std::cout
#include <cmath>        // std::abs

int main ()
{
  std::cout << "abs (3.1416) = " << std::abs (3.1416) << \n;
  std::cout << "abs (-10.6)  = " << std::abs (-10.6) << \n;
  return 0;
}