OC Data type

OC is an enhanced C feature, so it is basically consistent with C on variables and basic data types.

In OC, variable naming has the following rules:

Consists of letters, numbers, underscores, and $ symbols

Must start with a letter, underscore, $ symbol

Case sensitive

The reserved words of OC cannot be used when defining variables in OC, and the reserved words of OC are as follows:

The following basic data types are available in OC:

int: Declaring an integer variable

Double: Declaring a two-precision variable

float: Declaring floating-point variables

Char: Declaring a character-type variable

ID: Generic pointer type

Enum: declaring enum type

Long: Declares a variable or function of length integer

Short: Declaring a variable or function with a shorter integer

Signed: Declaring a signed type variable

struct: Declaring struct-body variables

Union: Declaring a common body (union) data type

Unsigned: Declaring an unsigned type variable

void: Declares that a function has no return value or no argument

Data type formatting characters:

Data type OC keyword format description boot character

integer int%d.%i

Short int%hd.%hi

Long, type long int%ld.%li

Unsigned short-integer unsigned int%u

No short integral type unsigned shorter%hu

unsigned long integer unsigned%lu

Float type float%f

Double-%f

Long Double%LF

Character Char-%c

Reprinted from: http://blog.csdn.net/mengxiangyue/article/details/11369679

OC Data type