CODEWITHSUNDEEP
c++pointers
cplusplusStudent
cplusplusStudent

Reputation: 9

Menu in C++ using pointers and functions

My objective to display a menu in which user chooses between 5 functions (1-5). After function runs and outputs its data. At the end the user chooses between functions (1-5) again.

My (incorrect) semi-code:

int main(){


int option;
int *pOption = &option;

bool choice = true;

cout << "Main menu: 

cout << "To use function 1 enter 1. \n";
cout << "To use function 2 enter 2. \n";
cout << "To use function 3 enter 3. \n";
cout << "To exit please enter 0. \n";
cin >> option;

while (choice == true) {

    if (option == 1) {
        cout << "You picked Function one: ";
        functionOne(Variable);
    }
    if (option == 2) {
        cout << "You picked Function 2: ";
        functionOne(Variable);
    }
    if (option == 3) {
        cout << "You picked Function 3: ";
        functionOne(Variable);
    }
}//end of while loop
return 0;

 }

For example lets say the user hits option 1 and goes to this function below. After we do our output how can I utilize the pointer 'pOption' I created to select a new function to use? Or am I completely missing the ball?

  void functionOne(Variable){

 cout<< "This is function 1";

 cin >>pOption;

 return;
 }

Upvotes: 0

Views: 1443

Answers (1)

user4581301
user4581301

Reputation: 33952

I'm going to stick with what seems to be the main question and get to the other bits of if I have time before the battery runs out.

Rather than ask for the next option insidea called function, do it in the main function like this:

cin >> option;

while (0 != option) <-exit loop if option is zero
{
    if (option == 1) {
        cout << "You picked Function one: ";
        functionOne(Variable);
    }
    if (option == 2) {
        cout << "You picked Function 2: ";
        functionOne(Variable);
    }
    if (option == 3) {
        cout << "You picked Function 3: ";
        functionOne(Variable);
    }
    cin >> option; <- ask for next option here
}//end of while loop

Next, you can save a bit of hassle by reading up on else if and switch

cin >> option;

while (0 != option) 
{
    switch (option) {
        case 1:
            cout << "You picked Function one: ";
            functionOne(Variable);
            break;
        case 2:
            cout << "You picked Function 2: ";
            functionOne(Variable);
            break;
        case 3:
            cout << "You picked Function 3: ";
            functionOne(Variable);
            break;
        default:
            cout << "You picked an unsupported option: " << option;

    }
    cin >> option; 
}//end of while loop

Next, what if some fool types in "I'm not a number, sucker" for option? Read up on input validation. Google's your friend here, not me anymore. MY battery's at 3% and I'm shutting down. Bye.

Upvotes: 1

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