Basic Singleton Solution

Class.cpp

#include <iostream>

double getFah();
class Converter {
                public:
                        static Converter* getInstance();
                        float fromFtoC(float);
};


int main() {
                Converter c;
                std::string name;
                std::cout << "What is your name? ";
                std::cin >> name; std::cin.ignore(80, '\n');
                std::cout << "Hello, " << name << "!\n";
                int temp;
                std::cout << "Please enter a temperature. ";
                double fah = getFah();
                std::cout << "Converted to Celsius, this temperature is " << c.fromFtoC(fah);
}


double getFah() {
                double input;
                while (!(std::cin >> input)) {
                        std::cout << "No letters please. try again: ";
                        std::cin.clear();
                        std::cin.ignore(80, '\n');
                }

                std::cin.ignore(80, '\n');
                return input;
}

float Converter::fromFtoC(float Fah) {
                return (Fah-32) * (5.0/9.0);
}

CPPSingletonExamplePart3.cpp

#include <iostream>
/*
Danley Nemorin
CS410 - Software Engineering

A basic solution to the design of an singleton


*/


class Converter {
        public:
                static Converter* getInstance();
                float fromFtoC(float);
                ~Converter();
        protected:
                Converter() { };
                static Converter* instance;
};

// Function prototype
double getFah();

// Static gets assigned here;
Converter *Converter::instance = 0;


int main() {
        std::string name;
        std::cout << "What is your name? ";
        std::cin >> name; std::cin.ignore(80, '\n');
        std::cout << "Hello, " << name << "!\n";
        int temp;
        std::cout << "Please enter a temperature. ";
        double fah = getFah();
        std::cout << "Converted to Celsius, this temperature is " << Converter::getInstance()->fromFtoC(fah);
}

// Function definition

double getFah() {
        double input;
        while (!(std::cin >> input)) {
                std::cout << "No letters please. try again: ";
                std::cin.clear();
                std::cin.ignore(80, '\n');

        }
        std::cin.ignore(80, '\n');
        return input;
}

float Converter::fromFtoC(float Fah) {
        return (Fah-32) * (5.0/9.0);
}

Converter* Converter::getInstance() {
        if (!instance) // If instance is empty (0,NULL,nullptr)
                instance = new Converter; // Allowed due to being within the Object Private Space
        return instance;
}

Converter::~Converter() {
        delete instance;
}

Function.cpp

 #include <iostream>

double getFah();
float fromFtoC(float);

int main() {
                std::string name;
                std::cout << "What is your name? ";
                std::cin >> name; std::cin.ignore(80, '\n');
                std::cout << "Hello, " << name << "!\n";
                int temp;
                std::cout << "Please enter a temperature. ";
                double fah = getFah();
                std::cout << "Converted to Celsius, this temperature is " << fromFtoC(fah);
}


double getFah() {
                double input;
                while (!(std::cin >> input)) {
                std::cout << "No letters please. try again: ";
                std::cin.clear();
                std::cin.ignore(80, '\n');

                                                                                        }
                std::cin.ignore(80, '\n');
                return input;
}

float fromFtoC(float Fah) {
                return (Fah-32) * (5.0/9.0);
}