C++/String/string copy

Copy char array from a string to a char pointer

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <string>

using std::string; int main() {

  string string1( "STRINGS" );
  int length = string1.length();
  char *ptr2 = new char[ length + 1 ];
  string1.copy( ptr2, length, 0 );
  ptr2[ length ] = "\0";
  cout << "\nptr2 is " << ptr2 << endl;
  delete [] ptr2;
  return 0;

} /* ptr2 is STRINGS

*/        
   
 </source>

Copying Strings

<source lang="cpp">

1. include <iostream>
2. include <string>

using namespace std; int main( ) {

  string s1( "this is a test" );
  string s1_copy;
  s1_copy = s1;
  string s1_duplicate( s1 );
  cout << "String 1:             " << s1
       << "\nCopy of String 1:     " << s1_copy
       << "\nDuplicate of String1: " << s1_duplicate;
  string s2( "B" );
  cout << "\n\nString 2:  " << s2;
  s1 = s2.substr( 0, 6 );
  cout << s1;

}

 </source>

Initializing, Assigning (Copying), and Concatenating Strings Using std::string

<source lang="cpp">

1. include <string>
2. include <iostream>

int main () {

  std::string str1 ("This is a C++ string! ");
  std::cout << "str1 = " << str1 << std::endl;
  std::string str2;
  str2 = str1;
  std::cout << "Result of assignment, str2 = " << str2 << std::endl;
  str2 = "Hello string!";
  std::cout << "After over-writing contents, str2 = " << str2;
  std::string strAddResult = str1 + str2;
  std::cout << strAddResult;
  return 0;

}

 </source>

STL string Instantiation and Copy Techniques

<source lang="cpp">

1. include <string>
2. include <iostream>

using namespace std; int main () {

  const char* pChar = "Hello String!";
  cout << pChar << endl;
  std::string strFromConst (pChar);
  cout << strFromConst << endl;
  std::string str2 ("Hello String!");
  std::string str2Copy (str2);
  cout << str2Copy << endl;
  // Initialize a string to the first 5 characters of another
  std::string subString (pChar, 5);
  cout << subString << endl;
  return 0;

}

 </source>