Question

Possible Duplicate:
Understanding NSString comparison in Objective-C

I want to compare an int and a string, but my code won’t work. Here is my code:

NSLog(@"enterPressed was called");
int answer = firstNumber + secondNumber;
NSLog(@"Real Answer: %d", answer);

NSString *numberFromTextField = inputTextField.text;
NSLog(@"Number From Text Field: %@", numberFromTextField);

if (numberFromTextField == [NSString stringWithFormat:@"%d", answer]) {
    NSLog(@"Correct!");
}

And here is the console:

2012-12-09 13:10:55.087 MathQuiz[10728:c07] enterPressed was called

2012-12-09 13:10:55.087 MathQuiz[10728:c07] Real Answer: 60

2012-12-09 13:10:55.088 MathQuiz[10728:c07] Number From Text Field: 60

Why doesn’t it say “Correct!”?

Answer 1

You need to compare it as,

if ([numberFromTextField intValue] == answer)

(numberFromTextField == [NSString stringWithFormat:@"%d", answer]) is comparing the memory address of both strings. Not the values. The following would have given you the right values,

if ([numberFromTextField isEqualToString:[NSString stringWithFormat:@"%d", answer]])