AN3350 datasheet(94/185 Pages) STMICROELECTRONICS

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C compiler

AN3350

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Doc ID 018512 Rev 2

12.2.6

Implicit return from main()

When the C99 extensions setting is on, the compiler inserts this statement at the end of a

program’s main() function if the function does not return a value:

return 0;

12.2.7

Non-constant static data initialization

When the C99 extensions setting is on, the compiler allows static variables to be initialized

with non-constant expressions.

12.2.8

Variable argument macros

When the C99 extensions setting is on, the compiler allows macros to have a variable

number of arguments. Example 31 shows an example.

Example 31 Variable argument macros example

#define MYLOG(...) fprintf(myfile, __VA_ARGS__)

#define MYVERSION 1

#define MYNAME "SockSorter"

int main(void)

{

MYLOG("%d %s\n", MYVERSION, MYNAME);

/* Expands to: fprintf(myfile, "%d %s\n", 1, "SockSorter"); */

return 0;

}

12.2.9

Extra C99 keywords

When the C99 extensions setting is on, the compiler recognizes extra keywords and the

language features they represent. Table 14 lists these keywords.

12.2.10

C++-style comments

When the C99 extensions setting is on, the compiler allows C++-style comments as well as

regular C comments. A C++-style comment begins with

Table 14.

Extra C99 keywords

This keyword or combination of keywords...

represents this language feature

_Bool

boolean data type

long long

integer data type

restrict

type qualifier

inline

function qualifier

_Complex

complex number data type

_Imaginary

imaginary number data type

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