c - A better way to print each word in a newline without using libraries (apart from stdio.h)?

I'm trying to write a program that takes from the standard
input stream a sentence, and based on the definition that a word is everything that is
between "spaces"; "spaces" being the space character, tab character or newline
character, so, for example, if the input stream is hey there this is some
test, the output should
be

hey
there
this
is
some
test

Here
is my try:

#include
            

#define TRUE 1
#define FALSE
            0

#define IS_SPACE(c) ((c) == ' ' || (c) == '\t' || (c) ==
            '\n')

int main() {

 for(int c, inWord = FALSE;
            (c = getchar()) != EOF;)
 if(!IS_SPACE(c)) {
 putchar(c);

            inWord = TRUE;
 }
 else if(inWord) {

            putchar('\n');
 inWord = FALSE;
 }

 return
            0;
}

But I
don't like this approach because I am manually entering TRUE and FALSE to
inWord when it can be automatically be done by
inWord = !IS_SPACE(c), but I don't know how to modify the code
to make just one call to IS_SPACE without creating another
temporal variable.