Ambiguous function call when data type casting from int to double and float : cast « Data Types « C++ Tutorial

1. C++ Tutorial
2. Data Types
3. cast

#include <iostream>
using namespace std;

float myfunc(float i);
double myfunc(double i);

int main()
{
  cout << myfunc(10.1) << " "; // unambiguous, calls myfunc(double)
  //cout << myfunc(10); // ambiguous

  return 0;
}

float myfunc(float i)
{
  return i;
}

double myfunc(double i)
{
  return -i;
}

-10.1 "