Convert a string object into a null-terminated string. - C++ STL

C++ examples for STL:string

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Description

Convert a string object into a null-terminated string.

Demo Code

#include <iostream>
#include <string>
#include <cstring>
using namespace std;
int main()//from   ww  w. ja va 2  s  .  c o m
{
   string str("This is a test.");
   char cstr[80];
   cout << "Here is the original string:\n";
   cout << str << "\n\n";
   // Obtain a pointer to the string.
   const char *p = str.c_str();
   cout << "Here is the null-terminated version of the string:\n";
   cout << p << "\n\n";
   // Copy the string into a statically allocated array.

   if(sizeof(cstr) < str.size() + 1) {
      cout << "Array is too small to hold the string.\n";
      return 0;
   }
   strcpy(cstr, p);
   cout << "Here is the string copied into cstr:\n" << cstr << "\n\n";
   // copy the string into a dynamically allocated array.
   try {
      char *p2 = new char[str.size()+1];
      strcpy(p2, str.c_str());
      cout << "String after being copied into dynamically-allocated array:\n";
      cout << p2 << endl;
      delete [] p2;
   } catch(bad_alloc ba) {
      cout << "Allocation Failure\n";
      return 1;
   }
   return 0;
}

Result


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