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