Thread: Variable and functions declarations for header file

If Wait() and main() are in the same file as you show in the first example above, then you don't need a header file. Yes, you could create a header file even if they are in the same file, in preparation to add more functions and more .c files.

If Wait() is in a separate file, then the prototype (declaration) for Wait() should be placed in the header file, and #include in both files.

If you print out an unsigned int, then use "%u" to display.

foo.c

Code:

#include<stdio.h>
#include"header.h"
 
int main (void)
{
    Wait ( 2);
    return 0;
}

file1.c

Code:

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

void Wait ( unsigned int size )
{
    unsigned int  i;
     
    for ( i = 0; i < size; i++)
    {
        printf(" Loop = %u \n", i);
    }
}

header.h

Code:

void Wait ( unsigned int size );