test.c

    #include <stdio.h>
    #include "stdint.h"

    #define SOME_VAR 1
    #ifdef SOME_VAR

    #define MULTILINE_MACRO one \
    two \
    three

    static uint64_t intWithSuffix = 42ull + ~1233L;
    static int octNum = 07232;
    static int invalidOctNum = 09231;
    static uint64_t hexNum = 0xDEADBEEF42;
    static uint64_t invalidHexNum = 0xGLDFKG;
    static char binNum = 0b0101010;

    static double d1 = 42. + 0x1.5p+2;
    static double d2 = .42;
    static double d3 = 42.3e1;
    static double d4 = .2e-12;
    static double d5 = 32.e+12;
    static float floatQualifier = 23.123f;

    static const char c1 = 'c';
    static const char c2 = '\n';
    static const char c2a = '\120'; // octal
    static const char c2o = '\0'; // octal, special case
    static const char c2b = '\x1f'; // hex
    static const char c2c = '\'';
    static const char c2d = '\\';
    static const char* c3  = "string";
    static const char* c4 = "\"string\n\t\012\x12\"";
    static const char* c5 = "multiline \
        string";

    //BEGIN region
    // TODO comment FIXME comment ### comment
    //END region

    #wrong

    /**
     * Doxygen
     * @param p1 text
     * \brief <b>bold text</b>
     * \dot
     * a -> b
     * \enddot
     *
     * \verbatim
     * <dummy>
     * \endverbatim
     * <html>text</html>
     */

    #endif

    /*
     * Empty lines after a line continuation character (see bug #405903)
     */
    #define one \
    two \

    int i = 0; // this should not be highlighted as a macro
    char* str = "string \

    int i = 0; // this should not be highlighted as a string

    /*
     * Digraphs (see bug #411508)
     */
    %:include <stdio.h>
    int a()
    <%
        [](){%>();
    }

    #define 1
     #define 2
      #define 3
       #define 4
        #define 5
    	#define tab

    #if 1
    int x; // variable shall not be grey
    #endif
    #if defined (A)
    int y; // variable shall not be grey
    #elif defined (B)
    int z; // variable shall not be grey
    #endif

    // C23 format
    "%w8ux %w8dx %DDfx";