Alternative to this; STDBOOL not found

Question

I am trying to read a key hit and then stop a code. In C.

#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

bool starting()
{
  char c;
    if (kbhit())
    {
        c=getch();
        if (c=="S"||c=="s")
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    else
    {
      return false;
    }
}

int main()
{
  while(!starting)
  {
    printf("line 1");
    delay(100);
  }
  return 0;
}

Without stdbool.h, it says errors like

syntax error: identifier 'starting', 
syntax error: ";"
syntax error: ")"
'starting': undeclared identifier

With stdbool.h, it says file not found. My compiler is the one that comes with Visual Studio 2010.

Any suggestion how to remove this? How can I still use a function that returns a boolean value?

ADDED sorry! for the short comment added. resolved mostly. Thanks all

Added More Errors: After Compiling: it reads:

filename.obj unresolved external symbol _delay referenced in function _main.

What should I do?

`typedef unsigned char bool; #define false 0 #define true 1` — , Jun 22 '13 at 09:57
Or just write it in C++. The C compiler in VS is crap. Even crappier than the C++ one (which also is). — , Jun 22 '13 at 09:57
If you're trying to call the function `starting` inside that while, you're missing a `()`. — Mat, Jun 22 '13 at 09:59
@DavidRF: `while(!starting)` tests the function pointer, not the function's return. — Mat, Jun 22 '13 at 10:04
This is in no way a compiler issue, so why is it "crap" here? It's a stdlib issue if you want, but the compiler is working perfectly fine here. — Mario, Jun 22 '13 at 10:06
@Mat, are you sure? if `starting` returns false there is no infinite loop — David Ranieri, Jun 22 '13 at 10:06
@DavidRF: `starting` is a function identifier. `starting()` is a function call. — Mat, Jun 22 '13 at 10:08
possible duplicate of [Using boolean values in C](http://stackoverflow.com/questions/1921539/using-boolean-values-in-c) — awesoon, Jun 22 '13 at 10:08
See http://stackoverflow.com/questions/1656874/where-is-stdbool-h and http://stackoverflow.com/questions/8548521/trying-to-use-include-stdbool-h-in-vs-2010. — Mihai8, Jun 22 '13 at 10:20

Yu Hao · Accepted Answer · 2013-06-22T11:33:02.320

6

stdbool.h is introduced in C99, and Visual Studio doesn't support C99. You can define the types yourself. One possible way is:

typedef int bool;
#define true 1
#define false 0

edited Jun 22 '13 at 11:33

answered Jun 22 '13 at 10:02

Yu Hao

119,891
44
235
294

you forgot semicolon after bool. – user2178841 Jun 22 '13 at 11:08
Can you have a look at last sentence i added? – user2178841 Jun 22 '13 at 11:12
@user2178841 Where is the function `delay` defined? – Yu Hao Jun 22 '13 at 11:34
VS2013 (and VS2014 CTPs) support C99. See http://blogs.msdn.com/b/vcblog/archive/2014/06/18/crt-features-fixes-and-breaking-changes-in-visual-studio-14-ctp1.aspx – vulcan raven Jul 12 '14 at 07:00

Mario · Answer 2 · 2013-06-22T10:04:49.840

-1

Three problems at once:

C doesn't know bool as a type of its own, but you can define it (e.g. through stdbool.h or just by using a typedef to any other integral type (usually unsigned char or int; this might be a question of memory usage vs. performance based).
MSVC is known for not having all the std**.h headers, especially older versions. So you most likely just don't have stdbool.h in VS 2010 (the reason for the file not found error).
You're missing brackets in this expression: while(!starting).

edited Jun 22 '13 at 10:04

answered Jun 22 '13 at 09:57

Mario

35,726
5
62
78

Do you happen to have born after 1999? – Jun 22 '13 at 09:58
No, I just happend to read only half a post from time to time. :P – Mario Jun 22 '13 at 10:05

Alternative to this; STDBOOL not found

2 Answers2