prin1.c

#include <stdio.h>
#include <cs50.h>
#include <time.h>
#include <stdlib.h>

void printDoors(int prin, int g);
int getPrincessMove(int ppos);

int main(void)
{
    srand(time(0));

    int ppos;
    int guess;
    int numGuesses = 1;
    int pmove;
    int direction;

    //initial position for princess is 1-17
    ppos = (rand() % 17) + 1;

    guess = 2;
    direction = 1;

    while (guess != ppos)
    {
        //print board
        printDoors(ppos, guess);

        //update location
        ppos = ppos + getPrincessMove(ppos);

        //update day/guess
        //direction starts out as positive 1
        //stay on door 16 the first time
        //reverse direction after 2nd time on door 16
        if (numGuesses == 15)
        {
            direction = 0;
        }
        else if (numGuesses == 16)
        {
            direction = -1;
        }
        guess = guess + direction;

        //update total
        numGuesses++;
    }

    //print total guesses / status
    printf("You won in %i moves\n", numGuesses);
}

void printDoors(int prin, int g)
{
    for (int i=1; i<=17; i++)
    {

        if (i==prin)
        {
            printf("P");
        }
        else if (i==g)
        {
            printf("X");
        }
        else
        {
            printf("_");
        }
    }
    printf("\n");
}



int getPrincessMove(int ppos)
{
    //move princess
        int pmove = rand() % 2;     //0 or 1

        //force move to -1 or +1
        if (pmove == 0)
        {
            pmove = -1;
        }

        //override random move if on edge
        if (ppos == 17)
        {
            pmove = -1;
        }
        else if (ppos == 1)
        {
            pmove = 1;
        }
        return pmove;

}