QUIZ II Operating System (SERVER)

// LINK SOAL : https://www.dropbox.com/sh/wussgfrqrmazf9g/AADnp_e-zKkHZWXyAFDQ5yJFa?dl=0
// LINK TEMPLATE : http://pastebin.com/Rc7A08xG

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

struct data{
    char s_name[31];
    char s_address[51];
    char r_name[31];
    char r_address[51];
    char i_name[16];
    float weight;
    char type[10];
};

int main(){
    int random1,random2,randomhuruf;//ascii A-Z 65-90
    float totalCost;//karena harus ada comanya
    struct sembuf s;
    int h=shmget(123456,sizeof(struct data),IPC_CREAT|0666);//h=shmid
    int e=semget(123456,1,IPC_CREAT|0666);//e=semid
    semctl(e,0,SETVAL,0);
    struct data *deliv=(struct data*)shmat(h,NULL,0666);
    printf("SNE Delivery Service - Client\n\n");
    int flag=0;
    do{
        s.sem_num=0;
        s.sem_op=-1;
        s.sem_flg=0;
        semop(e,&s,1);
        if(strcasecmp(deliv->s_name,"exit")!=0){//pastiin input bukan exit
            printf("SNE Delivery Receipt\n------------------------------------------\n");
            srand(time(NULL));
            random1=rand()%10;
            srand(time(NULL));
            random2=rand()%10;
            srand(time(NULL));
            randomhuruf=rand()%26+65;//baca jarak random 26 dimulai dari 65(A=65)
            printf("Deliver Code \t\t: TK%d%d%c\n",random1,random2,randomhuruf);//printfnya satu2,%d%d%c
            printf("Sender Name\t\t: %s\n",deliv->s_name);// "\t" untuk tab
            printf("Sender Address\t\t: %s\n",deliv->s_address);
            printf("Receiver Name\t\t: %s\n",deliv->r_name);
            printf("Receiver Address\t: %s\n",deliv->r_address);
            printf("Item Name\t\t: %s\n",deliv->i_name);
            printf("Item Weight\t\t: %.2f kg(s)\n",deliv->weight);// %.2f = 2 angak di belakang koma
            printf("Delivery Type\t\t: %s\n",deliv->type);
            if(strcmp(deliv->type,"Express")==0)
                totalCost=deliv->weight*27500;
            else
                totalCost=deliv->weight*15000;
            printf("Total Cost\t\t: Rp %.2f\n",totalCost);
            printf("\nThank you for the delivery\n\n");
        }
    }while(strcasecmp(deliv->s_name,"exit")!=0);
    shmdt(&deliv);
    shmctl(h,IPC_RMID,0);
    semctl(e,0,IPC_RMID);
}