如何将两个对象作为一个元素添加到向量？

Question

I written a code here to understand a problem. The program is supposed ask for how many numbers you'd like to store in a vector called vNumbers then proceed to create a vector the length of iNumbers (the number of iterations you've picked). You will then input your first number which will be pushed back into vNumbers and then ask for how many letters you'd like to put in (for each numbers) that would be stored in vector vLetters. After that it is supposed to print out the stuff inside vNumbers and vLetters. I can get the program to accept 1 letter for 1 number but i can't get it to have multiple letters for 1 number. So for example if i do this

Please enter how many numbers you'd like to add:

2

Please enter #1

100

how many letters would you like to add (for number 100)

2

Please enter a letter

A

Please enter a letter

B

Please enter #2

200

How many letters would you like to add (for number 200)

1

Please enter a letter

C

I should get this

You have entered:

100 AB

200 C

Instead what i get is this and i'm not sure why.

100 AB

200 ABC

#include <iostream>
#include <string>
#include <cctype>
#include <vector>
#include <algorithm>
using namespace std;



int main()
{
    string sLetters, sLettersB, sLettersC, sLettersA, sNumbers;
    vector<string> vLetters, vNumbers;
    int iLetters, iNumbers;

    cout << "how many NUMBERS would you like to add? ";
    cin >> iNumbers;
    cin.ignore();
    for (int j = 0; j < iNumbers; j++)
    {
        cout << j + 1 << "# Enter number ";
        getline(cin, sNumbers);
        vNumbers.push_back(sNumbers);

        cout << "how many LETTERS would you like to add to " << j + 1 << "#? ";
        cin >> iLetters;
        cin.ignore();
        for (int i = 0; i < iLetters; i++)
        {
            cout << "Enter letter";
            getline(cin, sLettersA);
            sLetters += sLettersA;

        }
        vLetters.push_back(sLetters); // How ever many letters are in sLetters should be added to n-1 index # in vector vLetters
    }
    for (int x = 0; x < vLetters.size(); x++)
    {
        cout << vNumbers[x] << "\t \t" << vLetters[x] << endl;


    }
    return 0;
}

Answer 1

The problem is that sLetters isn't being cleared down between iterations of the "entry" loop (this is why you get "ABC" on the second time through (the 'AB' is a left over from first iteration and remain in sLetters until removed).

But - as the comments above suggest, there's other issues with structure/relationships.

Answer 2

You code has a bug. See below for comments

    for (int i = 0; i < iLetters; i++)
    {
        cout << "Enter letter";
        getline(cin, sLettersA);
        sLetters += sLettersA;  // sLetters is defined outside for loop and no space

    }

So you can either define sLetters inside the first for loop or use clear()

    sLetters.clear();
    for (int i = 0; i < iLetters; i++)
    {
        cout << "Enter letter";
        getline(cin, sLettersA);
        sLetters += ' ' + sLettersA;
    }

or delete sLetters from the line 3, and define it later

    string sLetters;
    for (int i = 0; i < iLetters; i++)
    {
        cout << "Enter letter";
        getline(cin, sLettersA);
        sLetters += ' ' + sLettersA;  
    }