#include <iostream>
using namespace std;

//Write a simple calculator program. Ask the user if s/he wants to add ('+') subtract ('-'), multiply ('*') or divide ('/') 
//and then ask for the number. Perform the operation with the given number. Start the "display" at zero. Stop when 
//the user enters 'X' (for exit). Use a Do..While loop and "if" statements. 
int main()
{
	double total = 0, n = 0;
	char operation =  ' ';
	
	cout << "Current total is 0" << endl;

		//Asking for user input 
			do
			{
			cout << "Enter an operation: + - * / (or enter X to exit): ";
			cin >> operation;
			if (operation == 'X')
				{
					break;
				}
				 
				if ((operation != '+') && (operation != '-') && (operation != '*') && (operation != '/'))
						do 
						{
							cout << "Enter an operation: + - * / (or enter X to exit): ";
							cin >> operation;
						}
						while ((operation != '+') && (operation != '-') && (operation != '*') && (operation != '/'));
				
				cout << "Enter a number. " ;
				cin >> n;
				if (operation == '/') 
					
					do
					{
						cout << "Can not divide by zero!" << endl;
						cout << "Current total is " << total << endl;
					}	
					while (n = 0);

				 else cout << "Current total is ";
					
						if (operation == '+') 
							total = (total + n);
				 
							if (operation == '-') 
								total = (total - n);

								if (operation == '*') 
									total = (total * n);
	
									if (operation == '/') 
										total = (total / n);
									
											
					cout << total << endl;			
			
			}
			while (operation != 'X');	
			 
}

/*  if (operation == '/') 
    {  
      do
      {
        cout << "Can not divide by zero!" << endl;
        cout << "Current total is " << total << endl;
      }    
      while (n = 0);
    }
    else cout << "Current total is "; */

    if (operation == '/')
    {
      if(n == 0)
      {
        cout << "    Can't divide by zero! Try again." << endl;
        continue;    // a very useful tool
      }
      total = (total / n);
    }
    cout << "Current total is: "<< total << endl;

#include <iostream>
using namespace std;
int main()
{
	double n=0, n2=0;
	char operation;

	cout << "Current Total is " << n << endl;

	do
	{
		cout << "Enter an operation: + - * / (or enter X to exit):" << endl;
		cin >> operation;
		if (operation == 'X')
			break;
		cout << "Enter a number: " << endl;
		cin >> n2;
		switch (operation)
                {
                        case '+':
                                n += n2;
                                break;
                        case '-':
                                n -= n2;
                                break;
                        case '*':
                                n *= n2;
                                break;
                        case '/':
                if (n2 == 0)
                {
                 cout << "Can not divide by zero!" << endl;
        }
                else
                {
                                n /= n2;
        }
                                break;
}
		cout << "Current Total is " << n << endl;
	} while (operation != 'X');

}