CODEWITHSUNDEEP
cvisual-c++
user2178841
user2178841

Reputation: 859

Alternative to this; STDBOOL not found

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?

Upvotes: 2

Views: 7240

Answers (2)

Yu Hao
Yu Hao

Reputation: 122383

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

Upvotes: 6

Mario
Mario

Reputation: 36487

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).

Upvotes: -1

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