Hi all,

I am new to Cocoa programming and am trying to do something that I thought was 
straightforward but not working.  I am using the tag field of a button to tell 
me what button is pushed.  This code does not work

- (IBAction) numberPressed:(id)sender {
        NSLog(@"Sender tag is:%d", [sender tag]);
        if ([sender tag] << 10) {
                displayValues.rawNumber = [displayValues.rawNumber 
stringByAppendingString:[NSString stringWithFormat:@"%d", [sender tag]]];
        }

buttons with tags 1-9 work great but the button with tag 0 does not.  When I 
pass tag 0 the if statement is evaluated as false.  

When I press button with tag 1 I get "Sender tag is:1" and the if statement is 
evaluated as true.
When I press button with tag 0 I get "Sender tag is:0" and the if statement is 
evaluated as false.

What is going wrong here?

Steve
Steve’s daily photo blog





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