Program to print its Process ID, Parent Process ID and Group ID

#include "stdio.h"
#include "unistd.h"
#include "stdlib.h"
#include "sys/types.h"

int main()
{
pid_t pid, ppid;
gid_t gid;

/* get the process id */
if ((pid = getpid()) < 0)
{
perror("unable to get pid");
}
else {
printf("The process id is %d", pid);
}

/* get the parent process id */
if ((ppid = getppid()) < 0)
{
perror("unable to get the ppid");
} else
{
printf("The parent process id is %d", ppid);
}

/* get the group process id */
if ((gid = getgid()) < 0) {
perror("unable to get the group id");
} else
{
printf("The group id is %d", gid);
}

return(0);
}