Thread: Strings confusion, =/.

I'm confused about how exactly the string functions (strcat, etc.) work. I honestly just don't understand them at all, although more specifically, I don't understand how or what the string functions do in the following code example that they give:

Code:

#include <iostream> //For cout
#include <cstring>  //For the string functions

using namespace std;

int main()
{
  char name[50];
  char lastname[50];
  char fullname[100]; // Big enough to hold both name and lastname
  
  cout<<"Please enter your name: ";
  cin.getline ( name, 50 );
  if ( strcmp ( name, "Julienne" ) == 0 ) // Equal strings
    cout<<"That's my name too.\n";
  else                                    // Not equal
    cout<<"That's not my name.\n";
  // Find the length of your name
  cout<<"Your name is "<< strlen ( name ) <<" letters long\n";
  cout<<"Enter your last name: ";
  cin.getline ( lastname, 50 );
  fullname[0] = '\0';            // strcat searches for '\0' to cat after
  strcat ( fullname, name );     // Copy name into full name
  strcat ( fullname, " " );      // We want to separate the names by a space
  strcat ( fullname, lastname ); // Copy lastname onto the end of fullname
  cout<<"Your full name is "<< fullname <<"\n";
  cin.get();
}

If someone could please explain it to me a bit better than they do here, I would greatly appreciate it.

strlen - Gives the length of a string
strcpy - Copies one string to another string
strcat - Copies one string onto the end of another string
strcmp - Compares two strings, returns zero of there's no diff

For more info, consult the man pages.

Also, do you at least know about C++ string objects?

Originally Posted by UMR_Student

Also, do you at least know about C++ string objects?

Nope, not the slightest clue about them.

Awesome, thanks very much to both of you.

I think that char fullname[100]; must be char fullname[101];! Because if someone write a name and lastname which both contains 50 chars. Plus the space between the names. Then there is 100 + 1 = 101.