What is NSInteger?
NSInteger is a type definition that describes an integer – but it is NOT equivalent to int on 64-bit platforms. You can examine the typedef by cmd-clicking on NSInteger in Xcode. NSInteger is defined as int when building a 32-bit app and as long for 64-bit apps.
Is int always 32 bits?
int is always 32 bits wide. sizeof(T) represents the number of 8-bit bytes (octets) needed to store a variable of type T . (This is false because if say char is 32 bits, then sizeof(T) measures in 32-bit words.) We can use int everywhere in a program and ignore nuanced types like size_t , uint32_t , etc.
Is NSInteger primitive?
NSInteger is just like a traditional int in C. It’s a typedef. There are others like NSUInteger , CGFloat , etc. that all are synonyms for primitive types.
What is Objective C runtime?
The Objective-C runtime is a runtime library that provides support for the dynamic properties of the Objective-C language, and as such is linked to by all Objective-C apps. Objective-C runtime library support functions are implemented in the shared library found at /usr/lib/libobjc.
What is made up of NSError object?
The core attributes of an NSError object are an error domain (represented by a string), a domain-specific error code and a user info dictionary containing application specific information.
What is NSNumber in Swift?
NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .
Is Objective-C dynamically typed?
Objective-C has a mixture of static and dynamic typing. The plain C objects are statically typed, but the Objective-C objects are dynamically typed. The Objective-C runtime does not care what type an object is as long as the messages you send to your objects are recognised by the object.
What is NSError in Swift?
Information about an error condition including a domain, a domain-specific error code, and application-specific information.
What is NSError domain?
The core attributes of an NSError object—or, simply, an error object—are an error domain, a domain-specific error code, and a “user info” dictionary containing objects related to the error, most significantly description and recovery strings.
Is 3.14 A double or float?
double
This is the most commonly used data type in programming languages for assigning values having a real or decimal based number within, such as 3.14 for pi. It has single precision. It has the double precision or you can say two times more precision than float.
Should I use double or float?
Double is more precise than float and can store 64 bits, double of the number of bits float can store. Double is more precise and for storing large numbers, we prefer double over float. For example, to store the annual salary of the CEO of a company, double will be a more accurate choice.