Programming

#include <stdio.h>
    #include <sys/types.h>
    #include <sys/ipc.h>
    #include <time.h>
    #include <stdlib.h>
    #include <math.h>
    
    int waitSem(int semid) {
        struct sembuf wait_buf;
        wait_buf.sem_num = 0;
        wait_buf.sem_op = -1;
        wait_buf.sem_flg = SEM_UNDO;
        if(semop(semid, &wait_buf, 1) == -1) {
            perror("waitSem failed");
            exit(1);
           }
            return(0);
        }
    
    <code>int signalSem(int semid) {
    <code>struct sembuf signal_buf;
    
        signal_buf.sem_num = 0;
        signal_buf.sem_op = 1;
        signal_buf.sem_flg = SEM_UNDO;
        if(semop(semid, &signal_buf, 1) == -1) {
            perror("signalSem failed");
            exit(1);
            }
        return(0);
    }
    
    int main(){
            int x[9];
            int y[9];
            int op[9];
            int n = 10;
            int i;
            long int res[9];
            char *oper[9];
    
        key_t
        ftok(const char *pathname, int proj_id);
        key_t mykey;
        mykey = ftok("/", 80);
    
        int smget(mykey, 2, 2);
    
        srand(time(NULL));
        for(i=0;i<n;i++){
            x[i] = rand() % 11;
            y[i] = rand() % 11;
            op[i] = rand() % 3;
            switch(op[i]){
            case 0:
                oper[i] = "+";
                res[i]=x[i]+y[i];
                break;
            case 1:
                oper[i] = "*";
                res[i]=x[i]*y[i];
                break;
            case 2:
                oper[i] = "^";
                ris[i]=pow(x[i],y[i]);
                break;
            }
        }