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PO"numrt": identifyer not found despite of defining that function
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copied!<p>I'm writing a library of mathematical functions in C++. I made the sqrt function and it works well. I also tried to make a root function that counts n'th root of a number. I have 3 files - emath.cpp, emath.hpp, main.cpp (emath is name of my library).</p> <p>emath.cpp:</p> <pre><code>namespace emath { class emath { public: /* ... */ //Returns value of square root of a number. static double sqrt(double tur); //Rerurns value of a root of a number. static double numrt(int stopien, double tur); }; } </code></pre> <p>emath.hpp:</p> <pre><code>#ifndef EMATH_HPP #define EMATH_HPP using namespace std; namespace emath { class emath { public: /* ... */ int emath::derivative(double x) { return 0; } //**************************************************************** double emath::derivative(double number, int pow) { double result = 1; for (int i = 1; i < pow; i++) { result *= number; } result *= pow; return result; } //************************************************************************ double emath::derivative(double number, int pow, double numbey) { return ((derivative(number, pow) + derivative(numbey))); } //************************************************************************ double emath::sqrt(double tur) //This function { int a; static int i = 0; for (; i * i <= tur; i++) { } if (i * i == tur) { return i; } a = i; return sqrtl(a); } //************************************************************************ double emath::numrt(int stopien, double tur) //This function { int a; static int i = 0; for (; i * i <= tur; i++) { } if (i * i == tur) { return i; } a = i; static int mul = 1; for (int p = 0; p < stopien; p++) { mul *= i; } return numrtel(mul, i, a); } private: //**************************************************************** double emath::sqrtel(double tur, static int k = 0) //Implementation of Newton's Method { double a; //Creates a - our xn. if (k == 1000000) { return a; } a = a - ((a * a - tur) / derivative(a, 2, - tur)); //Proper implementation os Newton's Method ++k; //k is counter return sqrtel(a); } //*************************************************************** double emath::numrtel(int mul, int i, double tur, static int k = 0) { double a; //Creates a - our xn. if (k == 1000000) { return a; } a = a - ((mul - tur) / derivative(a, i, - tur)); //Proper implementation os Newton's Method ++k; //k is counter return numrtel(mul, i, a); } }; //end of class } //end of namespace #endif // EMATH_HPP </code></pre> <p>If my main.cpp is</p> <pre><code>#include <iostream> #include "emath.hpp" using namespace std; using namespace emath; int main() { double number; cin >> number; cout << sqrt(number); } </code></pre> <p>it works very well, but if main.cpp is</p> <pre><code>#include <iostream> #include "emath.hpp" using namespace std; using namespace emath; int main() { double number; cin >> number; cout << numrt(3, number); } </code></pre> <p>I get a compiler error: "numrt": identifyer not found. I'm using MS VS Studio 2012 Compiler with Qt Creator. Why is that?</p>

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