#include <iostream>
#include <cmath>
using namespace std;

void main()	{
	double number, number1, sum = 0.0, sum1 = 0.0;		
	char X, operation;							

	while (operation != 'X')
	{
		cout<<"Enter the operation you wish to compute:\n+ for addition\n- for subtraction\n^ to raise a number to a power\ns for square root\n* for multiplication\n/ for division\nenter 'X' to exit the program\n";
		cin>>operation;							
	
		switch (operation)
		{
			case '+':	cout<<"Enter the number you wish to add, enter 'X' to finish: ";
						cin>>number;

						while (number=X)	{
							break;
						}
						while (number != X)	{
							sum = sum1 + number;

							cout<<"Enter the number you wish to add, enter 'X' to finish: ";
							cin>>number;
						}
						cout<<"The sum of the numbers you entered is "<<sum<<".\n";
						break;
	
			case '-':	cout<<"Enter the number you wish to subtract from, enter 'X' to finish: ";
						cin>>number1;

						while (number != X)	{
							sum = number1-number;

						cout<<"Enter the number you wish to subtract, enter 'X' to finish: ";
						cin>>number;
						}
						cout<<"The difference of the numbers you entered is "<<sum<<".\n";
						break;

			case '*':	cout<<"Enter the number you wish to multiply, enter 'X' to finish: ";
						cin>>number1;

						while (number!= X)	{
							sum= number1*number;

							cout<<"Enter the number you wish to multiply, enter 'X' to finish: ";
							cin>>number;
						}
						cout<<"The product of the numbers you entered is "<<sum<<".\n";
						break;

			case '/':	cout<<"Enter the number you wish to divide, enter 'X' to finish: ";
						cin>>number1;

						while (number!= X && number1!= X && number!=0)	{
							sum=number1/number;

						cout<<"Enter the number you wish to divide by, enter 'X' to finish: ";
						cin>>number;
						}
						cout<<"The quotient of the numbers you entered is "<<sum<<".\n";
						break;

			case '^':	cout<<"Enter the number you wish to raise to a power, enter 'X' to finish: ";
						cin>>number1;

						while (number1!= X && number!= X)	{
							sum= pow(number1, number);

						cout<<"Enter the power you wish to raise the value to, enter 'X' to finish: ";
						cin>>number;
						}
						cout<<"The value of "<<number1<<"to the "<<number<<" is "<<sum<<".\n";
						break;

			case 's':
			case 'S':	cout<<"Enter the number you wish to take the square root of, enter 'X' to finish: ";
						cin>>number;

						while (number!= X)	{
							sum= sqrt(number);
						}
						cout<<"The square root of "<<number<<" is "<<sum<<".\n";
						break;

			case 'x':
			case 'X':	break;

			default:	cout<<"Are you sure this is what you want to do?";
						break;
		}
	}
}