Switch to Function

[Sillurechii]

Hey programmers, for this code what I'm trying to do is rewrite this program in terms of functions. I've messed around with it a little bit in the addition section but I don't know enough to make it work properly and I've looked around everywhere for an explanation, but nothing seems to help.

From there, I'm supposed to get the numbers from a file instead of using cin statements. Any clarification on how to do any of this is greatly appreciated.

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <fstream>
#include <math.h>


using namespace std;
int main()
{

char operation;
int num1 = 0, num2 = 0, remainder = 0;
double result;



cout << "What kinda basic algebra are you too lazy to do by hand? " << endl;
cout << "Addition: +\nSubtraction: -\nMultiplication: *\nDivision: /\nNumber to power n: ^\nFactorial: !\nQuit: q" << endl << endl;
cout << "Pick one, yo: ";
cin >> operation;
cout << endl;


while (operation != 'q' and operation != 'Q')
	{
	
switch(operation)
		{
		case '+':
			{ 	
			std::cout << "Pick the first number: ";
			std::cin >> num1;
			std::cout << "Pick the second number: ";
			std::cin >> num2;
			int addition(num1, num2)
			return result;
			std::cout << num1 << " + " << num2 << " = " << result << endl << endl;
			break;
			}
	
		case '-':
			{
			std::cout << "Pick the first number: ";
			std::cin >> num1;
			std::cout << "Pick the second number: ";
			std::cin >> num2;
			result = num1 - num2;
			std::cout << num1 << " - " << num2 << " = " << result << endl << endl;
			break;
			}	
				
		case '*':
			{
			std::cout << "Pick the first number: ";
			std::cin >> num1;
			std::cout << "Pick the second number: ";
			std::cin >> num2;
			result = num1 * num2;
			std::cout << num1 << " * " << num2 << " = " << result << endl << endl;
			break;
			}
		
		case '/':
			{
			std::cout << "Pick the dividend: ";
			std::cin >> num1;
			std::cout << "Pick the divisor: ";
			std::cin >> num2;
			result = num1 / num2;
			remainder = num1 % num2;
			std::cout << num1 << " / " << num2 << " = " << result << endl << endl;	
			std::cout << num1 << " % " << num2 << " = " << remainder << endl << endl;
			break;
			}
		
		case '^':
			{
			std::cout << "Pick the base number: ";
			std::cin >> num1;
			std::cout << "Pick the exponent: ";
			std::cin >> num2;
			result = pow(num1, num2);
			std::cout << num1 << " ^ " << num2 << " = " << result << endl << endl;
			break;
			}
		
		case '!':
			{
			std::cout << "Pick your number: ";
			std::cin >> num1;
			
			result = 1;
			
			for(int cnt = 2; cnt <= num1; cnt++)
			    {
			        result *= cnt;
			    }
			
			std::cout << num1 << "! = " << result << endl << endl;
			break;
			}
			
	
				
		default:
			{
			std::cout << "I know you're bad at math, but reading? Really? Check the options again, fam, and pick a viable one: " << endl << endl;
			std::cout << "Addition: +\nSubtraction: -\nMultiplication: *\nDivision: /\nNumber to power n: ^\nFactorial: !\nQuit: q" << endl << endl;
			std::cout << "So, which one is it: ";
			std::cin >> operation;
			}
			
		}
	

	cout << "\nAddition: +\nSubtraction: -\nMultiplication: *\nDivision: /\nNumber to power n: ^\nFactorial: !\nQuit: q" << endl << endl;
	cout << "Anything else?: ";
	cin >> operation;
	cout << endl;



		
	}	

cout << "Later, scrub.";

return 0;
}

[kingkush]

You must put a text file of all the data you need into your project folder and then write the code to open it. Once thats completed you can use getline(); If youre not sure how to do this let me know and ill post some of my old code showing how.