Question

I have simplifed some methods for ease of understanding and correction of the error. I get a ‘nan’ instead of getting the number and don’t understand why. I want to put the getNumber method inside the return statement. When I have the method inside it returns a string of nan but when I just put the 26 inside it returns 26, what I want.

-(double) getNumber { return 26; }


-(NSString *) convertToString {
        return [NSMutableString stringWithFormat: @"%Lf",[self getNumber]];
// returns 'nan'           when I replace [self getNumber] with 15 I get 15
}

Answer 1

You might want to use “%f” instead of “%Lf”, since you are passing a double, not a long double