How do I add string given by user inside an empty array and find length of it in C++

Question

I am new to C++ and was trying a lot to take strings from the user and add those inside an empty array. I read my book but did not get proper explanation. I understand my code is not right but what I am trying to do is, asking a user to give a string, and until the user types "Quit", the program should take the strings and add that to my empty array named listt. After that I declared variable named len and tried to get the length of the array that I just made. However I am getting several errors and looked for resources to fix my problems. Still I could not do it. It will be genuinely helpful if someone can please help me to solve this problem. Thank you very much. My code is:

#include <iostream>

using namespace std;
int main()
{
    string listt[];

    string word;
    cout<< "Enter word: ";

    while (word != "Quit" ){

        cin >> word;
        listt.push_back(word);
    }
    cout << listt;

    int len ;

    len = listt.size();
    cout << len;
    for (int i=0; i < len; i++){
        cout << i;
        cout << endl;
    
    }
    return 0; 
}

You're clearly used to another language, and are incorrectly assuming that code constructs/syntax in that language will work the same way in C++. That approach almost never works for any combination of language you know and language you wish to learn. Focus on learning C++, rather than on programming in the language you know. — Peter
– Peter, Commented Aug 2, 2020 at 10:20
Do not use another programming language as a model in writing C++ code. Even if you did get the code to compile, writing code using another language as a model will either create buggy programs, inefficient programs, or programs that just look plain weird to a C++ programmer. Also, you shouldn't just be "looking around for resources" when it comes to C++. The best resources are actual good C++ books. C++ is a very difficult language to learn properly, and you can't learn it by having a few cheat sheets of instructions here and there, like some other languages. — PaulMcKenzie
– PaulMcKenzie, Commented Aug 2, 2020 at 10:44

tdao · Accepted Answer · 2020-08-02 10:09:59Z

1

You should use vector instead of array:

So instead of:

string listt[]; // shouldn't compile anyway

use:

vector<string> listt;

Also, this is not ok:

cout << listt; // you can't print array or vector directly, so loop and print each item

Also, use for-each instead of C-style for

for (const auto &v : listt)
{
    cout << v << endl;
}

The rest of your code should be fine.

answered Aug 2, 2020 at 10:09

tdao

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Comments

Hikaru · Accepted Answer · 2020-08-02 10:13:24Z

In your code you use methods for class vector. You need to include library vector in your programm. Also you need to declare vector of strings as:

vector<string>listt;

If you want to output each element of the vector you need to use for loop instead.

for ( int i = 0; i < listt.size(); i++ ) cout << listt[i] << '\n';

So it's not correct

cout << listt;

Your programm will look like:

#include <iostream>
#include <vector>

using namespace std;
int main()
{
    vector<string> listt;

    string word;
    cout << "Enter word: ";

    while (word != "Quit") {

        cin >> word;
        listt.push_back(word);
    }

    int len;
    len = listt.size();
    cout << len;

    for (int i = 0; i < len; i++) {
        cout << listt[i];
        cout << endl;

    }
    return 0;
}

b23v · Accepted Answer · 2020-08-02 10:10:38Z

0

You are probably looking for vector<string>. What you are tried to make is an array, which does not have anything like push_back().

Vector docs

answered Aug 2, 2020 at 10:10

b23v

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