gambler.c

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

int main(int argc, string argv[])
{
    if (argc != 2)
    {
        printf("USAGE: ./gambler TRIALS\n");
        return 1;
    }

    //seed the randomizer
    srand(time(0));

    int bankroll;
    int bet;
    int const GOAL = 1100;
    int days;
    int bets;
    int flip;
    int total = 0;
    float avg = 0;
    int trials = atoi(argv[1]);


    for (int i=0; i<trials; i++)
    {
        bankroll = 1000;
        bet = 100;
        days = 0;

        while (bankroll > 0)
        {
            //Start the new day!
            bankroll = 1000;
            bets = 0;
            while (bankroll < GOAL && bankroll > 0)
            {
                flip = rand() % 2;  //0=lose, 1=win
                if (flip == 0)
                {
                    bankroll = bankroll - bet;
                }
                else
                {
                    bankroll = bankroll + bet;
                }
                printf("%i\n", bankroll);
                bets++;
            }
            printf("You have %i after %i bets\n", bankroll, bets);
            days++;
        }
        printf("You lasted %i days\n===============\n", days);
        total = total + days;
    }
    avg = (float) total / trials;
    printf("In %i simulations, you lasted an average of %f days\n", trials, avg);
}