Usage of: in c language

The usage of colon (:) in C language includes: used to mark statements; as conditional operator; specify range; access structure members; define bit fields; perform type conversion; used for macro definition.

Usage of: in C language

The colon (:) in C language is a multi-purpose operator , has the following usage:

1. Label statement

A colon can be used to mark a statement, such as the beginning of a loop or conditional statement. Marker statements can be used in jump or goto statements.

my_label:
    // 代码块

2. Conditional operator

The colon is the second part of the conditional operator, which will return one of two values ​​based on the value of the conditional expression.

条件 ? 值1 : 值2

3. Range operator

The colon can be used to specify a range, such as a subset of an array or a string.

数组[起始索引 : 结束索引 + 1]

4. Structure member access

The colon can be used to access the members of the structure.

结构体名称.成员名称

5. Bit field

The colon can be used to specify the width of the bit field.

struct {
    unsigned int my_bitfield : 4;
} my_struct;

6. Type conversion

The colon can be used to explicitly convert the type of an expression to another type.

(类型) 表达式

7. Macro definition

A colon can be used to define a macro, where the colon separates the macro name from the macro expansion content.

#define 宏名称 : 宏展开内容

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