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How to convert a std::string to const char* or char* in C++?
In this section, we will see how to convert C++ string (std::string) to const char* or char*. These formats are C style strings. We have a function called c_str(). This will help us to do the task. It returns a pointer to an array that contains a null-terminated sequence of characters (i.e., a C-string) representing the current value of the string object.
Following is the declaration for std::string::c_str.
const char* c_str() const;
This function returns a pointer to an array that contains a null-terminated sequence of characters (i.e., a C-string) representing the current value of the string object. If an exception is thrown, there are no changes in the string.
Example Code
#include <iostream>
#include <cstring>
#include <string>
int main () {
std::string str ("Please divide this sentence into parts");
char * cstr = new char [str.length()+1];
std::strcpy (cstr, str.c_str());
char * p = std::strtok (cstr," ");
while (p!=0) {
std::cout << p << '\n';
p = std::strtok(NULL," ");
}
delete[] cstr;
return 0;
}Output
Please divide this sentence into parts
Updated on: 30-Jul-2019
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