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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_string_data.htm below:

C++ String Data Management

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::data.

const char* data() const;

const char* data() const noexcept;

const char* data() const noexcept;

none

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.

if an exception is thrown, there are no changes in the string.

In below example for std::string::data.

#include <iostream>
#include <string>
#include <cstring>

int main () {
   int length;

   std::string str = "sairamkrishna mammahe";
   char* cstr = "sairamkrishna mammahe";

   if ( str.length() == std::strlen(cstr) ) {
      std::cout << "str and cstr have the same length.\n";

      if ( memcmp (cstr, str.data(), str.length() ) == 0 )
         std::cout << "str and cstr have the same content.\n";
   }
  return 0;
}

The sample output should be like this −

str and cstr have the same length.
str and cstr have the same content.  

string.htm

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