//"const" + type name for constants and
//type name for variables

//Int
int number = 42, otherNumber = 37;
const unsigned long maxInt64 = ULONG_MAX;
const int Mb = 1048576;

//Double
const double exp = 2.71828;
double billion = 1E+9;

//Float
const float pi = 3.14;

//String
const NSString *greeting = @"Hello";

//Multiline String
NSString *text = [NSString stringWithFormat:@"%@%@/",
    @"this is some\n",
    @"multiline text"];
//Bool
const Boolean sunIsStar = true;
bool needBackUp = false;
BOOL isObjectivC = YES;

//Character "A"
char charA = 'A'; //65, 0x41