HW8.2

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <conio.h>

#define P1 1
#define P2 2

int main () {
    int start, dest;    // start & destination of game
    int turn;           // determine who has first turn
    int total, jump;    // total point, jump of user
    int isEven = -1,            // previous jump is even or not?
        isInvalid,      // user input is invalid or not?
        isOut = 0,      // End game?
        Winner = 0;     // Save who win

    printf("..:: ICT GAME CENTER - SMART STRATEGY ::..\n\n");
    printf("> Start: ");
    scanf("%d", &start);
    total = start;
    do {
        printf("> Destination: ");
        scanf("%d", &dest);
        if (dest <= start) {
            printf("!!! Please enter destination bigger than start (%d)", start);
        }
    } while (dest <= start);
    srand(time(NULL));
    turn = rand() % 2 + 1;
    printf("> Who play first (randomly): %d", turn);
    putchar('\n');
    do {
        if (turn == P1) {
            printf("\n+ P1 - turn:\n");
        }
        else {
            printf("\n+ P2 - turn:\n");
        }
        do {
            printf("  > Choose a number: ");
            scanf("%d", &jump);
            if (jump > 5) {
                printf("  ! invalid - greater than 5 !\n");
                isInvalid = 1;
            } else if (jump < 1) {
                printf("  ! invalid - smaller than 1 !\n");
                isInvalid = 1;
            } else if (isEven == 0 && (jump % 2)) {
                printf("  ! invalid - odd as previous selected !\n");
                isInvalid = 1;
            } else if (isEven == 1 && !(jump % 2)) {
                printf("  ! invalid - even as previous selected !\n");
                isInvalid = 1;
            } else {
                isInvalid = 0;
                isEven = !(jump % 2);
            }
        } while (isInvalid);
        total += jump;
        printf("-> Now the value is %d\n", total);
        if (total >= dest) {
            if (turn == P1) {
                printf("\n!!! P1 WIN. CONGRATULATION !!!\n");
                Winner = P1;
            } else {
                printf("\n!!! P2 WIN. CONGRATULATION !!!\n");
                Winner = P2;
            }
            isOut = 1;
        }
        if (turn == P1) {
            turn = P2;
        }
        else {
            turn = P1;
        }
    } while (!isOut);
    getch();
    return 0;
}