if (number1 == 0.0 || number2 = 0.0)

#include <iostream>

using std::cout;
using std::cin;
using std::endl;
using std::string;


int main() //initialize main
{
	
	//declare variables
	char operation = ' ';
	double number1 = 0.0;
	double number2 = 0.0;
	double solution = 0.0;

	//gather data from end user
	cout << "This program will Add, Subtract, Multiply, or Divide two numbers.\n\n";
	cout << "Please enter the first number: ";
	cin >> number1;
	cout << "Please enter the second number: ";
	cin >> number2;
	cout << "Please enter 'a' for addition, 's' for subtraction, 'm' for multiplication, or 'd' for division: ";
	cin >> operation;




				//if it's division
		if (operation == 'd' || operation == 'D')
	       {
			if (number1 == 0.0 || number2 = 0.0)
			{
				cout << "Dividing by zero not allowed." << endl;
			}	
			else
			{
			solution = number2 / number1;
			cout << "The solution of the two numbers is: " << solution << endl;
			}
          }


		
	return 0;

}

if (number1 == 0.0 || number2 == 0.0)

if (number1 == 0.0 || number2 == 0.0)

std::string aString = "A guy"; // Assignment
std::string aString2 = "A boy"; // Assignment
if (aString == aString2) // Comparison
    std::cout << "A guy is a boy?" << std::endl;
else
    std::cout << "A guy is not a boy!" << std::endl;

if (number1 == 0.0 || number2 == 0.0)

if (number1 == 0.0)

solution = number2 / number1;

solution = number1 / number2;