C++ String Methods/Functions

• empty() method check if a string is empty or not. It will return 1 if the string is empty, otherwise 0.
• empty() Syntax:

  stringVar.empty();

  string str1 = "Welcome";

  string str2;

  bool x = str2.empty();

  cout << x; // display 1
• empty() Syntax:

  stringVar.empty();

  string str1 = "Welcome";

  string str2;

  bool x = str2.empty();

  cout << x; // display 1
• append() method is used to add a string at the end of another string.
• append() Syntax:

  stringVar.append(stringVar);

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.append(str2);

  cout << str1; // display Welcome to C++ Programming!
• append() Syntax:

  stringVar.append(stringVar);

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.append(str2);

  cout << str1; // display Welcome to C++ Programming!
• append() Syntax:

  stringVar.append(stringVar, pos, len);

  where:

  pos is the starting position to append, index base 0

  len is the number of character/s to append, it start with 1
• append() Syntax:

  stringVar.append(stringVar, pos, len);

  where:

  pos is the starting position to append, index base 0

  len is the number of character/s to append, it start with 1
• Example for append() method:

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.append(str2, 3, 3); //the position is C, then 3 characters to append which is C++

  cout << str1; // display Welcome C++
• Example for append() method:

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.append(str2, 3, 3); //the position is C, then 3 characters to append which is C++

  cout << str1; // display Welcome C++
• Example for append() method:

  string str1 = “Hello ";

  str1.append(“World”); //str1 is Hello World

  cout << str1; // display Hello World
• Example for append() method:

  string str1 = “Hello ";

  str1.append(“World”); //str1 is Hello World

  cout << str1; // display Hello World
• Example of append() method:

  string str1 = “Hello ";

  str1.append(“World”, 1, 3); //str1 is Hello orl

  //the position is 1, then 3 characters to append which is orl

  cout << str1; // display Hello orl
• Example for append() method:

  string str1 = “Hello"; str1.append(3, ‘!’); //str1 value is Hello!!!

  //will append 3 characters of !

  cout << str1; // display Hello!!!
• insert() method is used to insert characters or substrings into a string at a specific position.
• insert() method is used to insert characters or substrings into a string at a specific position.
• insert() Syntax:

  stringVar.insert(pos, string/stringVar);

  where:

  pos is the starting position to insert a string, index is base 0
• insert() Syntax:

  stringVar.insert(pos, string/stringVar);

  where:

  pos is the starting position to insert a string, index is base 0
• insert() Syntax:

  stringVar.insert(pos, string/stringVar);

  where:

  pos is the starting position to insert a string, index is base 0
• Example for insert() method:

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.insert(8, "Mickey");

  cout << str1; // display Welcome Mickey
• Example for insert() method:

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.insert(8, "Mickey");

  cout << str1; // display Welcome Mickey
• Example for insert() method:

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  str1.insert(7, "Mickey");

  cout << str1; // display WelcomeMickey

  cout << str1 << “!”; // display WelcomeMickey !
• Example for insert() method:

  string str1 = "Welcome ";

  string str2 = "to C++ Programming!";

  string str3 = "Jones“;

  str1.insert(7, str3);

  cout << str1; // display WelcomeJones