Why is my strcmp always returning true?

Question

I'm trying to compare user text input from an iphone app with the text in a static array I have declared. It is always returning "true", even when the text is different. After doing the strncmp, I display both text fields. To the human eye, they are what I expect the fields to be. The debugmsg I return to the screen shows what I expect the values to be, but the compare is always coming up true. Any suggestions would be appreciated. Thanks.

if (strncmp(SymbolEntered.text, 
[NSString stringWithCString:elements_table2[idx].element_symbol],2)==0)
{   
    DebugMsg.text = [NSString stringWithCString:"Correct answer"];
}
else 
{
    DebugMsg.text = [NSString stringWithCString:"Incorrect!"];
}

DebugMsg2.text = SymbolEntered.text;
DebugMsg3.text = [NSString stringWithCString:elements_table2[idx].element_symbol];

Answer 1

You really should do this with NSString, which has tons of comparison methods implemented, instead of CString (why are you using CString?). strcmp doesn't work with NSString.

if([SymbolEntered.text isEqualToString:[NSString stringWithCString:elements_table2[idx].element_symbol]]) {
    DebugMsg.text = @"Correct answer";
} else {
    DebugMsg.text = @"Incorrect answer";
}

Also instead of:

DebugMsg.text = [NSString stringWithCString:"Correct answer"];

you can do this:

DebugMsg.text = @"Correct answer";