On May 27, 2008, at 5:26 PM, Nick Zitzmann wrote:
On May 27, 2008, at 3:24 PM, Nathan wrote:
- (IBAction)operators:(id)sender {
OB=[operatorBar floatValue];
if (OB=1) {
[operator setFloatValue: 4];
}
if (OB=2) {
[operator setFloatValue: 5];
}
}
So you would expect that if operatorBar = 1, then OB will = 1, and
operator will = 4. I know the first part is ok due to testing, but
what happens when I run the program is that it acts like the if's
don't exist, so upon using operators method operator will equal 5
no matter what. What's wrong here?
In C, a single = is an assignment; a double == is a check for
equality.
Yup, and an assignment expression (like OB=2) evaluates to the value
that was assigned (in this caes, 2).
And conditionals in C treat 0 as false, and treat non-zero as true,
which is why both of your ifs always evaluate to true.
--Andy
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