Convert a C-string to std::string in C++

In this quick article, we’ll explore how to convert a C-string to std::string in C++.

1. Using string constructor

#include <iostream>

int main()

{

// C-style string

const char* cstr = "Techie Delight";

// string constructor accepts `const char*` as a parameter

std::string s(cstr);

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

return 0;

}

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2. Using `std::string::append` function

#include <iostream>

int main()

{

// C-style string

const char* cstr = "Techie Delight";

std::string s;

s.append(cstr);

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

return 0;

}

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3. Using `std::string::assign` function

#include <iostream>

int main()

{

// C-style string

const char* cstr = "Techie Delight";

std::string s;

s.assign(cstr);

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

return 0;

}

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4. Using + operator

#include <iostream>

int main()

{

// C-style string

const char* cstr = "Techie Delight";

std::string s;

s += cstr;

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

return 0;

}

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It is worth noting that all the above solutions will error out if char* is NULL.

That’s all about converting a C-string to std::string in C++.

Convert a C-string to std::string in C++

1. Using string constructor

2. Using std::string::append function

3. Using std::string::assign function

4. Using + operator

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2. Using `std::string::append` function

3. Using `std::string::assign` function