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How to convert a std::string to const char* or char*?

How can I convert a std::string to a char or a const char?
char String cpp
by

4 Answers

Bharatgxwzm
In the event that you simply need to pass a std::string to a capacity that needs const char you can utilize
std::string str;

const char  c = str.c_str();

In the event that you need to get a writable copyy, similar to char, you can do that with this:
std::string str;

char  writable = new char[str.size() + 1];

std::copy(str.begin(), str.end(), writable);

writable[str.size()] = '\0'; // don't forget the terminating 0



// don't forget to free the string after finished using it

delete[] writable;
MounikaDasa
We can also use string::data function here

#include <iostream>
#include <string>
int main()
{
std::string str = "std::string to const char";
char const c = str.data();
std::cout << c;
return 0;
}
the above program converts std::string to a pointer of characters to string data
sandhya6gczb
Use the following code to std: string to a pointer of characters or string data 


const char p_c_str = x.c_str();

const char* p_data  = x.data();

char* p_writable_data = x.data(); // for non-const x from C++17 

const char* p_x0    = &x[0];



      char p_x0_rw = &x[0];  // compiles iff x is not const...
sandhya6gczb
Use the following code to std: string to a pointer of characters or string data 


const char p_c_str = x.c_str();

const char* p_data  = x.data();

char* p_writable_data = x.data(); // for non-const x from C++17 

const char* p_x0    = &x[0];



      char p_x0_rw = &x[0];  // compiles iff x is not const...

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