Convert int to a string in C++

This post will discuss how to convert int to a string in C++.

1. Using `std::to_string` function

The most common and efficient way is to use the std::to_string function introduced with C++11, which returns a string representation of the specified value. It is overloaded for all data types.

We can also use std::to_wstring, which returns std::wstring.

#include <iostream>

#include <string>

int main()

{

int i = 10;

std::string s = std::to_string(i);

std::cout << s << std::endl;

return 0;

}

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Output:

10

2. Using string streams

Another good alternative is to use the stringstream to convert between strings and other data types. The idea is to insert a given integer into the stream and then write contents of its buffer to the std::string using its str() function. We need to include the <sstream> header file for this.

#include <iostream>

#include <string>

#include <sstream>

int main()

{

int i = 10;

std::stringstream ss;

ss << i;

std::string s = ss.str();

std::cout << s << std::endl;

return 0;

}

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Output:

10

3. Using boost `lexical_cast`

We can also use the boost lexical_cast library for converting an int to a string in C++. Please note that this solution is just a less-verbose alternative to the previous approach as lexical_cast uses streams behind the scenes.

#include <iostream>

#include <string>

#include <boost/lexical_cast.hpp>

int main()

{

int i = 10;

std::string s = boost::lexical_cast<std::string>(i);

std::cout << s << std::endl;

return 0;

}

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Output:

10

That’s all about converting int to a string in C++.

Convert int to a string in C++

1. Using std::to_string function

2. Using string streams

3. Using boost lexical_cast

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1. Using `std::to_string` function

3. Using boost `lexical_cast`