Consider a countdown program.
countdown.c:
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
int seconds = 3;
for (int i = seconds; i != 0; --i) {
printf("%i... ", i);
fflush(stdout);
sleep(1);
}
puts("Go!");
return 0;
}
The goal is to put the actual countdown code in a macro. It fits perfectly in a function, but a macro is used for illustration purposes.
