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basic_string c_str function in C++ STL

Last Updated : 07 Feb, 2023

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: 

// 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 = "GeeksForGeeks";

    // 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());
}

s1.size is equal to strlen(s1.c_str()) 
GeeksForGeeks 

Program 2: 

// 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;
    }
}

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:

// 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 = "GeeksforGeeks";
    std::string s2;

    // Function Call
    s2 = copyString(s1);
    std::cout << s2;
    return 0;
}

// This code is contributed by Susobhan Akhuli

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