Preprocessor giving compilation while declaring unsigned int x and initializing with a binary constant

Asked Jun 06 '18 at 03:45

Active Jun 06 '18 at 04:09

Viewed 25 times

I am getting error in Pro* C pre-compilation when I have declared the variables as

unsigned int x = 0b00001;
unsigned int y = 0b00010;
unsigned int z = 0b00100;

When the pre-compilation happens in pro*c , error is

    ....................1
    PCC-S-02201, Encountered the symbol "B00001" when expecting one of the following
    :

       ; , = ( [ * ? | & < > + - / % . ^ *= /= %= += -= <<= >>= &&=
       ||= ^= | & == != <= >= << >> ++ -- ->
    The symbol ";" was substituted for "B00001" to continue.

    GCC version is 
    gcc version 4.4.7 20120313 (Red Hat 4.4.7-18) (GCC)`enter code here`

When I try to run this code as a normal C code in a different file, it works just fine. The issue only occurs while running a pro*c code.

So, I want to understand what the exact problem is when a proc code is compiled and why no problem when C code compiles.

edited Jun 06 '18 at 04:09

chux - Reinstate Monica

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asked Jun 06 '18 at 03:45

Rohan Chitnis

`0b00001` is not standard C, try `1`. – chux - Reinstate Monica Jun 06 '18 at 03:51
Where are the preprocessor directives? I mean, which part is handled by the preprocessor? – J...S Jun 06 '18 at 03:53
@chux gcc seems to be okay with it. Apparently an extension. – J...S Jun 06 '18 at 03:54
@chux do you mean to say unsigned int x = 1; ? – Rohan Chitnis Jun 06 '18 at 03:54
Yes. Try `x=1; y = 2; z = 4;` – chux - Reinstate Monica Jun 06 '18 at 03:55
that works fine. But I want to do something like show them in binary. – Rohan Chitnis Jun 06 '18 at 03:56
can you please check this. https://www.tutorialspoint.com/cprogramming/c_bitwise_operators.htm – Rohan Chitnis Jun 06 '18 at 03:57
@RohanChitnis Then use non-standard C or `enum bit { B00000, B00001, B00010, B00011, B00100 };` or the like. There are no binary integer constants in standard C. – chux - Reinstate Monica Jun 06 '18 at 04:06

Preprocessor giving compilation while declaring unsigned int x and initializing with a binary constant

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