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Help Looping these functions/Array Help

aiiight (23)
So I've been working on this code, and the whole point of it is to loop at the end and allow the user to input 1,2,3, or 4 and then I print the options. I'm having trouble when they type in their choice: Whatever number they type in, it continues to "Please enter f/F for flying..." Even though I have a do while loop at the top.


I assume it is because choice isn't initialized in the main function - how do I fix that?


Also, how could I save their input and print it out if they type in 2 or 3?(If they type in 2 I ask them the type of sport, then print the ages of the people who made reservations)

Thank you!
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    #include<iostream>
    #include<iomanip>
    #include<string>

    using namespace std;
    // my prototypes
    
    void print_menu();
    int input_choice();
    char input_type();
    int input_age();
    double compute_rate();
    int input_reservation();
    void print_all();

    int main()
    {
        
        int choice;    
        int userAge;
        
       
    
         if (choice == 4)
        {
            return 0;
        }
        
        do
        {
            input_choice();
            compute_rate();
            
        } while (choice == 1);
        
       
    
        return 0;
    }

    void print_menu() // Printed as a void since nothing to return for this
    {
    cout << "Please pick from the following menu" << endl;
    cout << "1. Add a new reservation" << endl;
    cout << "2. Print all reservations" << endl;
    cout << "3. Print all reservations for a given sport" << endl;
    cout << "4. Quit" << endl;
    
    }

    int input_choice()
    {
        int choice = 0;
        
        print_menu();
        cin >> choice;
        
        return choice;
    }
    
    char input_type()
    {       
        char sport;
        
        cout << "Please enter f/F for flying, g/G for gliding and h/H for hang-gliding" << endl;
        cin >> sport;
        
        return sport;
    }
    
    int input_age()
    {
       
        int userAge;
        
        cout << "Please enter the age of the patron, minimum 16" << endl;
        cin >> userAge;
        
        return userAge;
    }
    
    double compute_rate()
    {
       
       double patronRate;
       char sport = input_type();
       int userAge = input_age();
        
        if (((userAge <= 25) && (sport == 'F')) || ((userAge <= 25) && (sport == 'f')))
            patronRate = 68.95;
        if (((userAge > 25) && (sport == 'F')) || ((userAge > 25) && (sport == 'f')))
            patronRate = 55.95;
        if (((userAge <= 25) && (sport == 'g')) || ((userAge <= 25) && (sport == 'G')))
            patronRate = 73.95;
        if (((userAge > 25) && (sport == 'g')) || ((userAge > 25) && (sport == 'G')))
            patronRate = 65.95;
        if (((userAge <= 25) && (sport == 'h')) || ((userAge <= 25) && (sport == 'H')))
            patronRate = 99.95;
        if (((userAge > 25) && (sport == 'h')) || ((userAge > 25) && (sport == 'H')))
            patronRate = 92.95;
            
            
        cout << "The insurance rate is $" << patronRate << "\n" << endl;
           
        
        return patronRate;
    }
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