#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <unistd.h>

#define TITLE "Test1"

typedef struct Node {
    int id;
    char question[150];
    char answer[20];
} Data_base;


enum { QUESTIONS = 5 };


int init(Data_base *test) {
    int id = 0;

    test[id].id = id + 1;
    strcpy(test[id].question, "5 + 10");
    strcpy(test[id].answer, "15");
    id++;

    test[id].id = id + 1;
    strcpy(test[id].question, "6 ^ 2");
    strcpy(test[id].answer, "36");
    id++;

    test[id].id = id + 1;
    strcpy(test[id].question, "6 / 3");
    strcpy(test[id].answer, "2");
    id++;

    test[id].id = id + 1;
    strcpy(test[id].question, "Which company is owner of iPhone?");
    strcpy(test[id].answer, "Apple");
    id++;

    test[id].id = id + 1;
    strcpy(test[id].question, "121 - 21");
    strcpy(test[id].answer, "100");

    return 0;
}

int
get_id(char *param) {
    char c;
    int i = 0, id = 0;
    c = param[0];
    while (c != 0) {
        if (c < '0' || c > '9') {
            return -1;
        }
        id = id * 10 + c - '0';
        i++;
        c = param[i];
    }
    return --id;
}

void
execute(char *command,char *param1, char *param2, Data_base *test) {
    int id = 0;
    if (!strcmp(command, "title")) {
        printf("%s\n", TITLE);
    } else {
        if (!strcmp(command, "get_q")) {
            id = get_id(param1);
            if (id == -1) {
                goto Error;
            }
            if (id < 0 || id >= QUESTIONS) {
                printf("Not found\n");
            } else {
                printf("%s\n", test[id].question);
            }
        } else {
            if (!strcmp(command, "check_a")) {
                id = get_id(param1);
                if (id == -1) {
                    goto Error;
                }
                if (id < 0 || id >= QUESTIONS) {
                    printf("Not found\n");
                } else {
                    if (!strcmp(param2, test[id].answer)) {
                        printf("+\n");
                    } else {
                        printf("-\n");
                    }
                }
            } else {
                if (!strcmp(command, "num")) {
                    printf("%d\n", QUESTIONS);
                } else {
                    printf("Unknown command: '%s'", command);
                }
            }
        }
    }
    return;
Error:
    printf("Bad command or param");
    return;
}

int
pars(char *str, Data_base *test) {
    char command[11] = { 0 }, param1[6] = { 0 }, param2[86] = { 0 };
    int done = 0, pred = 0, j = 0, i = 0;
    for (i = 0; i < 100; i++) {
        if (str[i] == 0){
            break;
        }
        if (str[i] != ' ') {
            pred = 0;
            if (done == 0) {
                command[j] = str[i];
                j++;
                if (j == 11) {
                    goto Error;
                }
            }
            if (done == 1) {
                param1[j] = str[i];
                j++;
                if (j == 6) {
                    goto Error;
                }
            }
            if (done == 2) {
                param2[j] = str[i];
                j++;
                if (j == 86) {
                    goto Error;
                }
            }
        } else {
            if (pred == 0) {
                pred = 1;
                done++;
                j=0;
            }
        }
    }
    execute(command, param1, param2, test);
    return 0;
Error:
    printf("Bad command or params");
    return 1;
}



int main()
{
    #define MAXSIZE 1024
    int n;
    Data_base test[5];
    init(test);
    int bad_command = 0, i = 0;
    char command[MAXSIZE+1] = { 0 };
    char input[MAXSIZE] = { 0 };
    char *c;
   setvbuf(stdout, NULL, _IOLBF, 0);
    while(fgets(input, 1024, stdin) != NULL)
    {
strcpy(command, input);
command[strlen(command)-1]=0;
pars(command, test);
//memset(command, 0, sizeof(command));
}
    return 0;
}