how to fix xcode warning “Expression result unused”

Question

I am doing a registration process with my app where the user enters in a number that I check against my db.. anyway long story short where I pass code into

Answer 1

It's because of the parenthesis. By writing (blabla) it becomes an expression, which you are not using as an expressing, hence the compiler complains.

Change to [NSString stringWithFormat: ...]; and it becomes a method.