Convert Vector of Characters to String in C++

Last Updated : 03 Dec, 2024

In this article, we will learn different methods to convert the vector of character to string in C++.

The most efficient method to convert the vector of characters to string is by using string's range constructor. Let’s take a look at an example:

C++

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<char> v = {'a', 'b', 'c', 'd', 'e'};

    // Convert vector of char to string
    string s(v.begin(), v.end());

    cout << s;
    return 0;
}

Output

abcde

Explanation: In the above code, we directly initialized the string s with the characters of the vector using its range constructor.

There are also some other methods in C++ by which we can convert the vector of character into string. Some of them are as follows:

Table of Content

Using accumulate()
Using Stringstream
Using push_back()

Using accumulate()

The accumulate() method can also be used to convert the vector of character to string by iterating through every character and append it to resulting string.

C++

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<char> v = {'a', 'b', 'c', 'd', 'e'};

    // Convert vector of character to string
    string s = accumulate(v.begin(), v.end(), string(),
                          [](const string &a, char b) { 
                            return a + b; });
    cout << s;
    return 0;
}

Output

abcde

Using Stringstream

Create a stringstream and insert all characters from the vector into it. After all characters are added, the stringstream str() function is called to convert the contents of the stream into a single string.

C++

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<char> v = {'a', 'b', 'c', 'd', 'e'};

    // creating stringstream object
    stringstream ss;

    // Insert every character of vector into stream
    for (auto it = v.begin(); it != v.end(); it++)
        ss << *it;

    // converts stream contents into a string
    cout << ss.str() << endl;
    return 0;
}

Output

abcde

Using push_back()

Iterate through the vector and add every character of vector into resultant string one by one using string push_back().

C++

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<char> v = {'a', 'b', 'c', 'd', 'e'};
    string s;

    // Convert vector of character to string
    for (auto i : v)
        s.push_back(i);
    cout << s;
    return 0;
}

Output

abcde

In this method, we can replace the string push_back() method with string append() or even string insert() method.

How to Convert a Single Character to String in C++?

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Convert Vector of Characters to String in C++

Using accumulate()

Using Stringstream

Using push_back()

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