C syntax - error C2143: syntax error : missing ')' before '*' [duplicate] - c++

Question

This question already has answers here:
Is bool a native C type?
(12 answers)
Closed 6 years ago.
Why am I getting a syntax error for my C header declaration?
Here is my header file, viterbi.h:
#ifndef VITERBI_H
#define VITERBI_H
void vitdec(float* , int , int , bool* );
#endif //VITERBI_H
And here is my implementation file, viterbi.c:
// viterbi.c : Defines the entry point for the console application.
//
#include "viterbi.h"
#include "math.h"
//void vitdec(float* sd, int frameLen, int rate, bool* hd);
void vitdec(float* sd, int frameLen, int rate, bool* hd)
{
//... The rest of the function
The errors from the Visual Studio 2010 compiler read:
viterbi.h(4): error C2143: syntax error : missing ')' before '*'
viterbi.h(4): error C2081: 'bool' : name in formal parameter list illegal
viterbi.h(4): error C2143: syntax error : missing '{' before '*'
viterbi.h(4): error C2059: syntax error : ')'
viterbi.h(4): error C2059: syntax error : ';'
viterbi.c(7): error C2065: 'bool' : undeclared identifier
viterbi.c(7): error C2065: 'hd' : undeclared identifier
viterbi.c(7): warning C4552: '*' : operator has no effect; expected operator with side-effect
As far as I have seen/can tell, this is valid syntax for a C declaration. If I compile viterbi.c as C++ code (viterbi.cpp), then the errors disappear. What is the syntax error?

Answer 1

bool is not a native C type, but for those using C99, try adding the line #include <stdbool.h>, which contains a macro that defines bool.
Since the C compiler in all Visual Studio/MSVC products uses C89, bool is not defined at all for you, as a native C type or otherwise. Workarounds include using typedef or enum to define bool. Examples are in the below link.
For more information, see: Is bool a native C type?