basic_string c_str function in C++ STL
The basic_string::c_str() is a built-in function in C++ which returns a pointer to an array that contains a null-terminated sequence of characters representing the current value of the basic_string object. This array includes the same sequence of characters that make up the value of the basic_string object plus an additional terminating null-character at the end.
Syntax:
const CharT* c_str() const
Parameter: The function does not accept any parameter.
Return Value : The function returns a constant Null terminated pointer to the character array storage of the string.
Below is the implementation of the above function:
Program 1:
CPP
// C++ code for illustration of // basic_string::c_str function #include <bits/stdc++.h> #include <string> using namespace std; int main() { // declare a example string string s1 = "w3wiki" ; // check if the size of the string is same as the // size of character pointer given by c_str if (s1.size() == strlen (s1.c_str())) { cout << "s1.size is equal to strlen(s1.c_str()) " << endl; } else { cout << "s1.size is not equal to strlen(s1.c_str())" << endl; } // print the string printf ( "%s \n" , s1.c_str()); } |
Output
s1.size is equal to strlen(s1.c_str()) w3wiki
Program 2:
CPP
// C++ code for illustration of // basic_string::c_str function #include <bits/stdc++.h> #include <string> using namespace std; int main() { // declare a example string string s1 = "Aditya" ; // print the characters of the string for ( int i = 0; i < s1.length(); i++) { cout << "The " << i + 1 << "th character of string " << s1 << " is " << s1.c_str()[i] << endl; } } |
Output
The 1th character of string Aditya is A The 2th character of string Aditya is d The 3th character of string Aditya is i The 4th character of string Aditya is t The 5th character of string Aditya is y The 6th character of string Aditya is a
Program 3:
C++
// CPP program to copy the string // using std::string::c_str() method #include <bits/stdc++.h> // Function to copy the string const char * copyString(std::string s) { const char * s2; // std::string::c_str() method s2 = s.c_str(); return s2; } // Driver Code int main() { std::string s1 = "w3wiki" ; std::string s2; // Function Call s2 = copyString(s1); std::cout << s2; return 0; } // This code is contributed by Susobhan Akhuli |
Output
w3wiki
Contact Us