A Basic Calculator.

Here is my code:

Code:

//calc.h
#include <iostream>
#include <cmath>

using namespace std;

inline void operations()
{
	cout<<"x,/,+,-,^,s2(square root)\n";
}

float math()
{
	float x;
    float y;
    char a;
	float answer;
   cout<<"enter an problem (4o for operations)";
   cin>> x >> a >> y;

	switch (a){
	case 'o':
		answer = (char) 0;
	    operations();
		break;
	case 's':
		answer = sqrt (x);
		break;
	case 'x':
		answer = x*y;
		break;
	case '/':
		answer = x/y;
		break;
	case '+':
		answer = x+y;
		break;
	case '-':
		answer = x-y;
		break;
	case '^':
		answer = pow (x,y);
		break;
	}
	return answer;
}

Code:

//calculator test.cpp
#include <iostream>
#include <dos.h>
#include "calc.h"

using namespace std;

int main()
{ 
	float answer = math();

	cout<< answer <<"\n";

	system("pause");
}

I have two problems:
1)I have to type 4o twice for t to show the operations.
2)I don't want to have to press 4 (well any other number) for it to show the operations.

Read the input as a line using getline(), then parse it using stringstream (after checking for 'o').

Can you give me an example?

Code:

string line;
getline(cin, line);
if (line.at(0) == 'o') {
...
} else {
stringstream ss(line);
ss >> x >> a >> y;
}

thanks