Asking user to continue or not

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I made a program that will prompt the user to enter a few details about him. I manage to separate the code by creating a class, then writing a code if they want to continue to input details again. The output seems to have a glitch idk about the Do While, after it takes the input of Y or y it won't let me type my name but instead, it proceeds to the next question.

What I have tried:

intMain.cpp:

C++

#include <iostream>
#include <limits>
#include "Classes.h"
using namespace std;

int main()
{
    asking();
    return 0;
}

Classes.h:

C++

#pragma once
#ifndef CLASSES_H_
#define CLASSES_H_


#define MAX_LENGTH 100
class Person {
public:
    char name[MAX_LENGTH] = { 0 };
    int age;
    int studentNo;
};

void asking();

#endif /*CLASSES_H_*/

Functions.cpp:

C++

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

using namespace std;

void asking() {
    char again;
	do {
        class Person p;
        p.name;
        p.age;
        p.studentNo;

        std::cout << "\nPlease Enter your name:";
        std::cin.getline(p.name, MAX_LENGTH);
        std::cout << "\nPlease Enter your age:";
        std::cin >> p.age;
        //input validation, allow only input integers
        while (1)
        {
            if (cin.fail()) {
                cin.clear();
                cin.ignore(numeric_limits<streamsize>::max(), '\n');
                std::cout << "Error! Please enter only integers!\n";
                cin >> p.age;
            }
            if (!cin.fail())
                break;
        }

        std::cout << "\nPlease Enter your studentNumber:";
        std::cin >> p.studentNo;

        std::cout << "Your name is: " << p.name << endl;
        std::cout << "Your Age is: " << p.age << endl;
        std::cout << "Your student number is: " << p.studentNo << endl;
        std::cout << "\n";

        std::cout << "\tDo you want to input another data?(Y/N):";
        cin >> again;
    } while (toupper(again) == 'Y');
}

Posted 13-May-23 23:45pm

ImMac4

Updated 14-May-23 0:20am

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OriginalGriff · Accepted Answer · 2023-05-14T00:20:00

again is declared as a single char value, so the ENTER that terminated it is still in the input buffer.

I'd write a simple method:

C++

void EmptyBuffer()
   {
   cin.ignore(numeric_limits<streamsize>::max(), '\n');
   }

And call it before each prompt:

C++

EmptyBuffer();
std::cout << "\nPlease Enter your name:";
std::cin.getline(p.name, MAX_LENGTH);
EmptyBuffer();
std::cout << "\nPlease Enter your age:";
std::cin >> p.age;
...
EmptyBuffer();
std::cout << "\tDo you want to input another data?(Y/N):";
cin >> again;

That way, anything left in the buffer is disposed of.