Problem with pow function

[kaduuk]

Hey guys,

I've created my own version to use setprecision.
However, when I try to compile my code, it gives me this error message:

In function `float setprecision(float, int)':
error: call of overloaded `pow(int, int&)' is ambiguous
C:/Dev-Cpp/include/math.h:150: note: candidates are: double pow(double, double)
C:/Dev-Cpp/include/c++/3.4.2/cmath:361: note:                 long double std::pow(long double, int)
C:/Dev-Cpp/include/c++/3.4.2/cmath:357: note:                 float std::pow(float, int)
C:/Dev-Cpp/include/c++/3.4.2/cmath:353: note:                 double std::pow(double, int)
C:/Dev-Cpp/include/c++/3.4.2/cmath:349: note:                 long double std::pow(long double, long double)
C:/Dev-Cpp/include/c++/3.4.2/cmath:345: note:                 float std::pow(float, float)
error: call of overloaded `pow(int, int&)' is ambiguous
C:/Dev-Cpp/include/math.h:150: note: candidates are: double pow(double, double)
C:/Dev-Cpp/include/c++/3.4.2/cmath:361: note:                 long double std::pow(long double, int)
C:/Dev-Cpp/include/c++/3.4.2/cmath:357: note:                 float std::pow(float, int)
C:/Dev-Cpp/include/c++/3.4.2/cmath:353: note:                 double std::pow(double, int)
C:/Dev-Cpp/include/c++/3.4.2/cmath:349: note:                 long double std::pow(long double, long double)
C:/Dev-Cpp/include/c++/3.4.2/cmath:345: note:                 float std::pow(float, float)

Execution terminated

The function is:

#include <iostream>
#include <cmath>
#include <math.h>

float setprecision(float result, int round)
{
      result=result*pow(10,round);
         int y=(int) result;
         result=y/(pow(10,round));
         return result;
}

I don't realy get this error, because I think this pow function is correct..
Could someone please explain whats wrong?

Thanks :)

[Athar]

Just read the error message... as you can see, there is no pow(int,int), so you need to choose one of the other ones.

[kaduuk]

Ok, so I changed the 10 into a double (double power = 10), but what would be the point of that?
Why can't you have a pow(int,int)?

Thanks!

[mgupta]

It is because the pow function used here has no matching definition in std namespace. However you are not even using std so its strange that you get an error.
Because I could compile it without using namespace std, but get an error upon using it.

The program compiles fine with g++ 3.4.6

#include <iostream>
#include <cmath>

float setprecision(float result, int round)
{
      result=result*pow(10,round);
         int y=(int) result;
         result=y/(pow(10,round));
         return result;
}

int main()
{
   float x = setprecision(10.0, 2);
   std::cout<<x<<std::endl;
   return 0;
}

A good explanation is still needed.