Character Conversion Still Not RIght (Objective-C)

Question

FIrst, thanks to all who responded to my first two questions. I have tried what was suggested and still nothing works. I thought I would create another post with the code that I am using. Just for some background: I am creating a guessing game for my son and I need to change characters form character to decimal to character. I have added the code and the logs. I hope this is more helpful.

-(IBAction)CHANGE:(id)sender
NSString    *working_text;
NSInteger   working_text_length;
NSInteger   new_key_char_num;
NSInteger   key_char_num;
NSInteger   key_char_position = 0;
NSInteger   char_num = 0;
NSString    *altered_text;

working_text = UITextView_1.text; 
working_text_length = working_text.length;
altered_text = @"";
UITextView_1.text = @"";

int k = 0;
while (k < working_text_length)
{
char_num = [working_text characterAtIndex:k];   
key_char_num  = 65;
new_key_char_num = char_num  + key_char_num;
    UITextView_1.text = [UITextView_1.text   
    stringByAppendingFormat:@"%c",new_key_char_num];   



 NSLog(@"char_num................%c",char_num);
 NSLog(@"char_num................%d",char_num);
 NSLog(@"key_char_num........... %d",key_char_num);
 NSLog(@"new_key_char_num........%d",new_key_char_num);
 NSLog(@"new_key_char_num........%c",new_key_char_num);
 NSLog(@" ");

 char_num = 0;
 k++;
}


 NSLog(@"UITextView_1.text full text...%@",UITextView_1.text);
 NSLog(@"first  %c",[UITextView_1.text characterAtIndex:0]);
 NSLog(@"second %c",[UITextView_1.text characterAtIndex:1]);
 NSLog(@"third  %c",[UITextView_1.text characterAtIndex:2]);


 // release code is not shown


}

LOGS

2009-10-04 22:43:04.949 DaVinci SMS[20757:20b] char_num................A
2009-10-04 22:43:04.951 DaVinci SMS[20757:20b] char_num................65
2009-10-04 22:43:04.951 DaVinci SMS[20757:20b] key_char_num........... 65
2009-10-04 22:43:04.952 DaVinci SMS[20757:20b] new_key_char_num........130
2009-10-04 22:43:04.953 DaVinci SMS[20757:20b] new_key_char_num........Ç
2009-10-04 22:43:04.953 DaVinci SMS[20757:20b]  
2009-10-04 22:43:04.954 DaVinci SMS[20757:20b] char_num................B
2009-10-04 22:43:04.955 DaVinci SMS[20757:20b] char_num................66
2009-10-04 22:43:04.956 DaVinci SMS[20757:20b] key_char_num........... 65
2009-10-04 22:43:04.956 DaVinci SMS[20757:20b] new_key_char_num........131
2009-10-04 22:43:04.957 DaVinci SMS[20757:20b] new_key_char_num........É
2009-10-04 22:43:04.957 DaVinci SMS[20757:20b]  
2009-10-04 22:43:04.958 DaVinci SMS[20757:20b] char_num................C
2009-10-04 22:43:04.959 DaVinci SMS[20757:20b] char_num................67
2009-10-04 22:43:04.959 DaVinci SMS[20757:20b] key_char_num........... 65
2009-10-04 22:43:04.960 DaVinci SMS[20757:20b] new_key_char_num........132
2009-10-04 22:43:04.960 DaVinci SMS[20757:20b] new_key_char_num........Ñ
2009-10-04 22:43:04.961 DaVinci SMS[20757:20b]  
2009-10-04 22:43:04.961 DaVinci SMS[20757:20b] UITextView_1.text...ÇÉÑ
2009-10-04 22:43:04.962 DaVinci SMS[20757:20b] first  «
2009-10-04 22:43:04.962 DaVinci SMS[20757:20b] second …
2009-10-04 22:43:04.963 DaVinci SMS[20757:20b] third  —

I entered the characters 'ABC' in the UITextView. I am just using three characters for now. If you notice at the bottome og the log the complete UITextView_1.text string is not equal to the individual characters that I pull using the characterAtIndex method. This is driving me crazy.

Answer 1

If you want to go from char to integer and back, no need to add anything - you can simply treat the unichar as an integer:

NSString *s = @"ABC";
unichar c = [s characterAtIndex: 0];
NSLog(@"char code: %i, char: %c", c, c); // output: char code: 65, char: A