Are #include and #define C statements?

#include and #define are not C statements. In C language, only those ending with a semicolon (;) are regarded as C statements; "#" represents a preprocessing macro. #include and #define do not participate in compilation, but the source code is processed before the compiler compiles the source code. Processing adjustments.

include and #define are not C statements.

Only those ending with semicolon; are regarded as C statements.

#include and #define do not participate in compilation, but are processed by the preprocessor.

Among them, #include The preprocessor is responsible for introducing the content introduced by file into the current file, which is just a simple expansion.

#define A B simply replaces the occurrences of A with B in the file.

# represents preprocessing macros. These statements are not compiled into machine code for execution. Instead, the source code is processed and adjusted before the compiler compiles the source code.

For example, #define a 1 defines a constant, which is actually equivalent to the compiler replacing all corresponding constant symbols with constant values ​​before compilation. Where a appears in all programs, the compiler replaces it with 1. There is no variable a involved in the actual running process.

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