Help! Sample prog. on user-define string functions

[orbandjay]

Hello! People... i just want to know how to program a string function.
example: strcmp();
or strcpy();without using their function. User define funtion..tnx

[Sebastiani]

easy. if(a[x++] != b[x++])return false;

[Unregistered]

Becauce when you are working with string(char *) you have to have a solid understanding how pointers (and arrays) work.

I suggest you learn pointerarithmetic in depth.

[orbandjay]

how about the length?
strlen();

[Unregistered]

int strlen(char *something)
{
int i;

       for (i = 0; *something != '\0'; something++)
           i++;
       return i;
}

[MrWizard]

String length can also be written as...

int StringLenth( char *pString )
{
  int length = 0;

  if( !pString ) // If invalid string, return 0 length
    return( length );
  
  while( *pString++ ) // go through each element
    ++length;

  return( length );
}

[Sebastiani]

And finally, how it's done with a char pointer!

int stringlen( char *string )
 {
   char *length = string;

   while( *(length++) ) ;

   return length - string;
 }