Question

how to make choices ic C++

Answer 1

#include <iostream>

int main(){

int x = 10;

if(x>10){ std::cout<<"x is greater than 10";}

elseif(x<10){ std::cout<<"x is smaller than 10";}

else {"x is equal to 10";}

return 0;

}

Answer 2

How about this one?

main.cpp

#include "QuestionWithAnswers.h"
#include <iostream>

int main()
{
    std::string answers[] = { "Pizza", "Burger", "Hot dog" };
    QuestionWithChoices question = QuestionWithChoices("What's your favourite fast food?", answers, 3);
    
    int choice = question.GetAnswer();
    if (choice == -1)
    {
        std::cout << "Invalid choice." << std::endl;
        return -1;
    }
    
    std::cout << "Your favourite food is " << answers[choice - 1] << '.' << std::endl;
    return 0;
}

QuestionWithAnswers.h

#pragma once

#include <string>

class QuestionWithChoices
{
private:
    std::string question;
    const std::string * answers;
    size_t answerCount;

public:
    QuestionWithChoices(const std::string & question, const std::string * answers, size_t answerCount);
    int GetAnswer();
};

QuestionWithAnswers.cpp

#include "QuestionWithAnswers.h"
#include <cstdlib>
#include <iostream>

QuestionWithChoices::QuestionWithChoices(const std::string & question, const std::string * answers, size_t answerCount)
{
    this->question = question;
    this->answers = answers;
    this->answerCount = answerCount;
}

int QuestionWithChoices::GetAnswer()
{
    std::cout << question << std::endl;
    
    for (size_t i = 0; i < answerCount; i++)
        std::cout << i + 1 << ". " << answers[i] << std::endl;
    
    std::cout << "? ";

    std::string choice;
    std::cin >> choice;
    int result = std::atoi(choice.c_str()); // atoi returns 0 if it cannot get a number, so let's keep the valid answers between 1 and answerCount.
    if (result < 1 || result > answerCount)
        return -1;
    
    return result;
}

Answer 3

You can make choices in C++ by using conditional statements like if, else-if, else and switch:

Syntax for if, else-if, else:

#include <iostream>
using namespace std;

int main() {
    int number;
    cout << "Enter a number: ";
    cin >> number;

    if (number > 0) {
        cout << "The number is positive." << endl;
    } else if (number < 0) {
        cout << "The number is negative." << endl;
    } else {
        cout << "The number is zero." << endl;
    }

    return 0;
}

Syntax for Switch

#include <iostream>
using namespace std;

int main() {
    int choice;
    cout << "Choose an option (1-3): ";
    cin >> choice;

    switch (choice) {
        case 1:
            cout << "You chose option 1." << endl;
            break;
        case 2:
            cout << "You chose option 2." << endl;
            break;
        case 3:
            cout << "You chose option 3." << endl;
            break;
        default:
            cout << "Invalid choice! Please choose a number between 1 and 3." << endl;
    }

    return 0;
}