Anyone knows a good tutorial about all the string functions? I''m trying to figure out how to do several things with strings in C++, but I don''t know their functions. I''m trying things like check a string character per character and then modify it.

Using strings in C++ is easy, provided you''re using C++ strings and not C strings. C++ strings are encapsulated in a class provided by the C++ Standard Library while C strings are merely null-terminated char arrays, with a bunch of external functions for manipulating them.

Here''s how you use C++ strings:

#include <iostream>#include <string> int main( void ){  using namespace std;   string str = "This is a string.";  cout << str << endl;  return 0;} 

That assigns and prints out the value of a string. What''s with the using namespace std thingie? The standardized C++ library headers place all their classes, objects and symbols within the std namespaces (namespaces are a method to resolve naming collisions - essentially to allow you freely write functions with any signature without fear of another function being identical, which results in linker errors).

Say we wanted to get a string from the user (one word) and count the number of occurences of a single letter in it, here''s what we might do:

#include <iostream>#include <string> int main( void ){  using namespace std;   char ch;  string str;  cout << "Please enter a _single word_ to scan: ";  cin >> str;  cout << "Enter the letter to scan for: ";  cin >> ch;   int n = 0, len = str.size(), count = 0;  for( ; n < len; ++n )    if( str[n] == ch )      ++count;   cout << "The letter " << ch << " was found " << count << " times in the word " << str << endl;  return 0;} 

But what if we wanted more than one word? What if we wanted to get a whole line of text? We''d use the getline function that is overloaded for strings:

#include <iostream>#include <string> int main( void ){  using namespace std;   string str;  cout << "Enter a line of text: " << endl;  getline( cin, str );  cout << "The text you entered was:\n" << str << endl;  return 0;} 

Well, that''s a very simple and rudimentary primer on using strings. Check your compiler documentation for more information on the string class (string is a typdef for basic_string<char>, so your docs may only have a basic_string entry). MSDN and SGI also have good documentation (the SGI documentation is excellent, but not exactly beginner-friendly); both links are in my signature.

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Thanks to Kylotan for the idea!

Are you talking about std::string? You might want to try SGI''s STL docs.