ftp.nice.ch/Attic/openStep/implementation/gnustep/sources/libobjects-0.1.19.tgz#/libobjects-0.1.19/checks/string.m

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#include <Foundation/NSString.h>

/* For demo of Strings as Collections of char's. */
#include <objects/NSString.h>

void
print_string(NSString* s)
{
  printf("The string [%s], length %d\n", [s cString], [s length]);
}

int main()
{
  id s = @"This is a test string";
  id s2;

  print_string(s);

  s2 = [s stringByAppendingString:@" with something added"];
  print_string(s2);

  s2 = [s mutableCopy];
  [s2 replaceCharactersInRange:((NSRange){10,4})
      withString:@"changed"];
  print_string(s2);

  /* An example of treating a string like a Collection:  
     Increment each char. */
  {
    id s3;
    void rot13(elt c)
      {
	[s3 appendElement:(char)(c.char_u + 1)];
      }

    s3 = [NSMutableString stringWithCapacity:[s2 length]];
    [s2 withElementsCall:rot13];
    print_string(s3);
  }
  
  exit(0);
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.