Question

If I write the following function, I get a warning and an error on the third line.

int myYear (NSString *timevar)
{
if ([timevar isEqualToString:@"yr"]) {
    return ...
}
}

Xcode says

1. Semantic Issue: Implicit declaration of function ‘If’…
2. Parse Issue: Expected ‘;’ after expression

What am I doing wrong?

Answer 1

This is because if is a keyword, and keywords in Objective C are case-sensitive^*. Same goes for other keywords, such as int.

// Use lowercase "i" in the "if"
if ([timevar isEqualToString:@"yr"]) {
    return ...
}

---

^* This is not a universal rule: for example, VB.NET will accept both if and If.