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I'm teaching myself C++ (my first programming language), and as an exploration I decided to see if I could make a simple four-function calculator. The thing is I'm having trouble. I managed to successfully write a program that would input two integers and return all four functions of the two (their sum, difference, quotient and product) but I couldn't get it to just give me one at a time (a problem with my if clauses I think).

So I started from scratch and wrote this:

Now I get a return value of 0, regardless of the input integers and the chosen function. I'm new to C++, so could anyone tell me what I'm doing wrong?

Thank you.

Code:

```
int chooseOperator(int OP, int num1, int num2)
{
if (OP == '+')
return add(num1, num2);
if (OP == '-')
return subtract(num1, num2);
if (OP == '*')
return multiply(num1, num2);
if (OP == '/')
return divide(num1, num2);
else
return 0;
}
int main()
{
using namespace std;
cout << "Thank you, will you please enter your first integer:" << endl;
int num1;
cin >> num1;
cout << "Thank you, will you please enter your second integer:" << endl;
int num2;
cin >> num2;
cout << "Will you please choose an operator:" << endl;
int O;
cin >> O;
cout << chooseOperator(O, num1, num2);
cin.clear();
cin.ignore(255, '\n');
cin.get();
return 0;
}
```

(I didn't copy and paste the trivial stuff like the function definitions but I'm not worried that's the problem)