(ALT) QUIZ II Operating System (SERVER)

// LINK SOAL https://www.dropbox.com/sh/qaih86hmdsadrrh/AAARgvRLhdMbFfQj4TuFLNRna?dl=0
// LINK TEMPLATE : http://pastebin.com/Rc7A08xG

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/sem.h>
#include <sys/shm.h>

struct data{
    char nama[21];
    char nat[10];
    char gender[10];
    int j_pen;
    int j_adl;
    int j_chl;
    char destination[10];
};

int main(){
    struct sembuf s;
    int h=shmget(121212, sizeof(struct data), IPC_CREAT|0666);
    int e=semget(121212, 1, IPC_CREAT|0666);
    struct data *book=(struct data *)shmat(h,NULL,0666);
    semctl(e,0,SETVAL,0);
    printf("BOOKING - SERVER\n==============================\n\n");
    int r1,r2,r3,r4;
    do{
        s.sem_num=0;
        s.sem_op=-1;
        s.sem_flg=0;
        semop(e,&s,1);
        if(strcasecmp(book->nama,"exit")!=0){
            srand(time(NULL));
            r1=rand()%5+2;//random 2-6
            r2=rand()%9+71;//random G-O
            r3=rand()%5;//random 0-4
            r4=rand()%4+99;//random c-f
            if(strcasecmp(book->nat,"Local")==0){
                printf("=========================\n");
                printf("BOOKING CODE : LC%d%c%d%c\n",r1,r2,r3,r4);//print satu-satu
                printf("=========================\n\n");
            }
            else if(strcasecmp(book->nat,"Tourist")==0){
                printf("=========================\n");
                printf("BOOKING CODE : TS%d%c%d%c\n",r1,r2,r3,r4);
                printf("=========================\n\n");
            }
            if(strcasecmp(book->gender,"Male")==0)
                printf("Name \t\t: Mr. %s\n",book->nama);//bisa pake sprintf
            else {
                char temp[50];
                sprintf(temp,"Mrs. %s",book->nama);//pake cara sprintf
                printf("Name \t\t: %s\n",temp);
            }
            printf("Nationality \t: %s\n",book->nat);
            printf("Adult \t\t: %d\n",book->j_adl);
            printf("Child \t\t: %d\n",book->j_chl);
            printf("Destination \t: %s\n",book->destination);
            int tujuan;
            float pajak,total;
            if(strcasecmp(book->destination,"Jakarta")==0)
                tujuan=1000000;
            else if(strcasecmp(book->destination,"Bandung")==0)
                tujuan=1500000;
            else if(strcasecmp(book->destination,"Malang")==0)
                tujuan=2500000;
            if(strcasecmp(book->nat,"Local")==0){
                pajak=0.1;//10% itu 0.1
            }
            else if(strcasecmp(book->nat,"Tourist")==0){
                pajak=0.25;//25% itu 0.25
            }
            total=(tujuan*(1+pajak)*book->j_adl)+(tujuan*(1+pajak)*book->j_chl*0.5);//ati2 tanda kurungnya
            printf("Total Cost\t: Rp %.2f\n",total);
            printf("THANK YOU, HAVE A NICE TRIP\n=========================\n\n\n");
        }
    }while(strcasecmp(book->nama,"exit")!=0);
    shmdt(&book);
    shmctl(h,IPC_RMID,0);
    semctl(e,0,IPC_RMID);
}