how to generate a state transition diagram in c

how to generate a state transition diagram in c.. give me the implementation steps

 

Code:

#include <stdio.h>
#include <stdlib.h>

void
Puts(const char *txt)
{ 
        if (puts(txt) == EOF) {
                perror("stdout");
                exit(EXIT_FAILURE);
        }
}

int
main(void)
{
        Puts(" -------     -------");
        Puts(" |  1  | --> |  2  |");
        Puts(" -------     -------");
        return EXIT_SUCCESS;
}

 

thanks for the code