Josiah Martin

November 16, 2010, November 16, 2010 04:35, permalink

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Jonathan

December 13, 2010, December 13, 2010 13:49, permalink

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using namespace std;
#include <iostream>
void main ()
{
	
	//Declares 3 Variables to be held in the program.
	float Variable_1;
	float Variable_2;
	float Result;
	int Operation = 1;
	int Rerun = 1;
	
	while (Rerun == 1)
	{
		//Asks the user what operation they wish to do.
		cout<<"Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide."<<endl;
		cin>>Operation;
		//The user, using cin, Inputs 2 variables
		cout<<"Input number 1:"<<endl;
		cin>> Variable_1;
		cout<<"Input Number 2:"<<endl;
		cin>>Variable_2;
		cout<<"The answer is: "<<endl;
		//Now use Var_1 and Var_2 to calculate the result.  It's easier in VB with the elseif command, but I couldn't find it in C++.
		//Addition
			if (Operation == 1)
		{
			Result = Variable_1 + Variable_2;
			cout << Result << endl;
		}
			//Subtraction
			if (Operation == 2)
		{
			Result = Variable_1 - Variable_2;
			cout << Result << endl;
		}
			//Multiplication
			if (Operation == 3)
		{
			Result = Variable_1 * Variable_2;
			cout << Result << endl;
		}
			//Division
			if (Operation == 4)
		{
			Result = Variable_1 / Variable_2;
			cout << Result << endl;
		}
		cout<<"Do you want to do another equasion?  (1 for yes, 2 for no)"<<endl;
		cin>>Rerun;
	}
}

Ants

December 14, 2010, December 14, 2010 19:47, permalink

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#include <iostream>

using namespace std;

class Operation
{
public:
    virtual float DoOperation(float a, float b) = 0;
};

class Add : public Operation
{
public:
    virtual float DoOperation(float a, float b)
    {
        return a + b;
    }
};

class Subtract : public Operation
{
public:
    virtual float DoOperation(float a, float b)
    {
        return a - b;
    }
};

class Multiply : public Operation
{
public:
    virtual float DoOperation(float a, float b)
    {
        return a * b;
    }
};

class Divide : public Operation
{
public:
    virtual float DoOperation(float a, float b)
    {
        return a / b;
    }
};

class InvalidInputException
{
};

template<class T>
T PromptInput(const char * prompt)
{
    T input;
    cout << prompt << endl;
    cin >> input;

    if (cin.fail() || cin.bad())
        throw InvalidInputException();

    return input;
}

Operation * GetOperation()
{
    while (true)
    {
        switch(PromptInput<int>("Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide."))
        {
        case 1:
            return new Add();

        case 2:
            return new Subtract();

        case 3:
            return new Multiply();

        case 4:
            return new Divide();
        }
    }
}

bool RunAgain()
{
    while (true)
    {
        switch(PromptInput<int>("Do you want to do another equation?  (1 for yes, 2 for no)"))
        {
        case 1:
            return true;

        case 2:
            return false;
        }
    }
}

void main()
{
    try
    {
        do
        {
            Operation * operation = GetOperation();
            float v1 = PromptInput<float>("Input number 1:");
            float v2 = PromptInput<float>("Input number 2:");
            cout << "The answer is: " << operation->DoOperation(v1, v2) << endl;
            delete operation;
        } while (RunAgain());
    }

    catch(InvalidInputException)
    {
        cerr << "Invalid Input. Aborting now." << endl;
    }
}

Matthew G

May 31, 2011, May 31, 2011 21:40, permalink

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#include <iostream>

using namespace std;

template <class T>
class operations
{
	public:
		T perform(int perf, T lhs, T rhs)
		{
			T result;

			if(perf == 1)
			{
				result = lhs + rhs;
			}
			else if(perf == 2)
			{
				result = lhs - rhs;
			}
			else if(perf == 3)
			{
				result = lhs * rhs;
			}
			else if(perf == 4)
			{
				result = lhs / rhs;
			}

			return result;
		}
};

int main()
{

	float Variable_1;
	float Variable_2;
	float Result;
	int Operation = 1;
	int Rerun = 1;

	operations<float>* op = new operations<float>();

	while(Rerun == 1)
	{
		cout << "Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide." << endl;
		cin >> Operation;

		cout << "Input number 1:" << endl;
		cin >> Variable_1;

		cout << "Input Number 2:" << endl;
		cin >> Variable_2;

		cout << "The answer is: ";

		Result = op->perform(Operation, Variable_1, Variable_2);
		cout << Result << endl;

		cout << "Do you want to do another equation?  (1 for yes, 0 for no)";
		cin >> Rerun;
	}

	return 0;
}

Matthew G

May 31, 2011, May 31, 2011 21:41, permalink

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#include <iostream>

using namespace std;

template <class T>
class operations
{
	public:
		T perform(int perf, T lhs, T rhs)
		{
			T result;

			if(perf == 1)
			{
				result = lhs + rhs;
			}
			else if(perf == 2)
			{
				result = lhs - rhs;
			}
			else if(perf == 3)
			{
				result = lhs * rhs;
			}
			else if(perf == 4)
			{
				result = lhs / rhs;
			}

			return result;
		}
};

int main()
{

	float Variable_1;
	float Variable_2;
	float Result;
	int Operation = 1;
	int Rerun = 1;

	operations<float>* op = new operations<float>();

	while(Rerun == 1)
	{
		cout << "Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide." << endl;
		cin >> Operation;

		cout << "Input number 1:" << endl;
		cin >> Variable_1;

		cout << "Input Number 2:" << endl;
		cin >> Variable_2;

		cout << "The answer is: ";

		Result = op->perform(Operation, Variable_1, Variable_2);
		cout << Result << endl;

		cout << "Do you want to do another equation?  (1 for yes, 0 for no)";
		cin >> Rerun;
	}

	return 0;
}