Pointer operator

#include <iostream>
using namespace std;

void getInput(char*, float*, float*);
void calculate(char*, float*, float*, float*);
void displayResult(char*, float*, float*, float*);

int main()
{
    char operation;
    float num1, num2, result;

    cout << "MENU\n****\n";
    cout << "+: Add\n-: Subtract\n*: Multiply\n/: Divide\nx: Exit\n";

    while(1)
    {
        getInput(&operation, &num1, &num2);
        calculate(&operation, &num1, &num2, &result);
        displayResult(&operation, &num1, &num2, &result);
        cout << endl;
    }
}

void getInput(char* ptrOp, float* ptr1, float* ptr2)
{
    cout << "\nEnter your choice: ";
    cin >> *ptrOp;
    if(*ptrOp == 'x' || *ptrOp == 'X')
        exit(1);

    cout << "Enter first number: ";
    cin >> *ptr1;
    cout << "Enter second number: ";
    cin >> *ptr2;
}

void calculate(char* ptrOp, float* ptr1, float* ptr2, float* ptrResult)
{
    if(*ptrOp == '+')
        *ptrResult = *ptr1 + *ptr2;

    else if(*ptrOp == '-')
        *ptrResult = *ptr1 - *ptr2;

    else if(*ptrOp == '*')
        *ptrResult = *ptr1 * *ptr2;

    else if(*ptrOp == '/')
        *ptrResult = *ptr1 / *ptr2;
}

void displayResult(char* ptrOp, float* ptr1, float* ptr2, float* ptrResult)
{
    cout << *ptr1 << " " << *ptrOp << " " << *ptr2 << " = " << *ptrResult;
}
/*
    You should try it sometime.
*/