(ALT) QUIZ II Operating System (CLIENT)

// 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 - CLIENT\n==============================\n\n");
    int flag=0,i;
    do{
        do{
            flag=0;
            printf("Input Your Name [5..20] : ");
            scanf("%[^\n]",book->nama);getchar();
            if(strlen(book->nama)>=5&&strlen(book->nama)<=20)
                flag=1;
            else if(strcasecmp(book->nama,"exit")==0)
                break;
        }while(flag==0);
        if(strcasecmp(book->nama,"exit")!=0){
            do{
                flag=0;
                printf("Input Your Nationality [Local | Tourist] : ");
                scanf("%[^\n]",book->nat);getchar();
                if(strcasecmp(book->nat,"Local")==0||strcasecmp(book->nat,"Tourist")==0)
                    flag=1;
            }while(flag==0);
            do{
                flag=0;
                printf("Input Your Gender [Male | Female] : ");
                scanf("%[^\n]",book->gender);getchar();
                if(strcmp(book->gender,"Male")==0||strcmp(book->gender,"Female")==0)
                    flag=1;
            }while(flag==0);
            do{
                flag=0;
                printf("Passenger [1...10] : ");
                scanf("%d",&book->j_pen);getchar();fflush(stdin);
                if(book->j_pen>0&&book->j_pen<=10)
                    flag=1;
            }while(flag==0);
            do{
                flag=0;
                char answer;
                printf("Any Child[Y|N] ");
                scanf("%c",&answer);getchar();fflush(stdin);
                if(answer=='Y'){
                    do{
                        flag=0;
                        printf("Adults : ");
                        scanf("%d",&book->j_adl);getchar();fflush(stdin);
                        if(book->j_adl>0&&book->j_adl<=book->j_pen){//validasiin harus jumlah adul<=jumlah penumpang
                            flag=1;
                            book->j_chl=book->j_pen-book->j_adl;//kalo udah itung childnya berapa
                        }
                    }while(flag==0);
                    flag=1;
                }
                else if(answer=='N'){//kalo ga ada child
                    book->j_adl=book->j_pen;//langsung masukin semua penumpang ke adult
                    book->j_chl=0;//childnya 0
                    flag=1;
                }
            }while(flag==0);
            do{
                flag=0;
                printf("Destination [Jakarta | Bandung | Malang] : ");
                scanf("%[^\n]",book->destination);getchar();
                if(strcmp(book->destination,"Jakarta")==0||strcmp(book->destination,"Malang")==0||strcmp(book->destination,"Bandung")==0)
                    flag=1;
            }while(flag==0);
        }
        s.sem_num=0;
        s.sem_op=1;
        s.sem_flg=0;
        semop(e,&s,1);
        printf("Input Data, Press Enter\n\n");
        getchar();
    }while(strcasecmp(book->nama,"exit")!=0);
    shmdt(&book);
    shmctl(h,IPC_RMID,0);
    semctl(e,0,IPC_RMID);
}