餐廳模擬

Question

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#define Empty 1
#define Full 0

float ChanceOfArrival (float CustomersPerMinute)
{
float CustomersArrivalChance;
int i;

/*Customers arriving per second */

CustomersArrivalChance = (CustomersPerMinute / 60) * 100;

printf ("The chance of customers arriving is: %0.3f%%\n", CustomersArrivalChance);

/* each 10 minute interval */

for (i = 0; i <= 18; i++)
{
    intervals (CustomersArrivalChance);
}

return CustomersArrivalChance;
}

int intervals (CustomersArrivalChance)
{

int totalCustomers = 0, totalWait = 0, queue = 0, SecondsInterval, waitingCustomers = 0;
int Cash1Salad, Cash1Buger, Cash2Salad, Cash2Burger;
int Cash1 = 1, Cash2 = 1;
int cointoss;
int x, Empty1, Empty2;
int CustomersServed = 0;
float RatePerMinute = 0, AverageWait = 0;
static int intervalNumber;
srand(time(NULL));

/*What could possibly happen every second in a 10 minute interval */
for (SecondsInterval = 0; SecondsInterval <= 600; SecondsInterval++)
{
    x = rand() % 101;

    if (CustomersArrivalChance >= x)
    {
        /*Customers Arrive this second */

        totalCustomers++;
        queue++;
        /*Choosing a cash at random */

        cointoss = rand()%2;
     if (queue > 0)
     {



        /* Cash 1 is open cash 2 is busy so the customer goes to cash 1 and chooses
        at random what they want to eat */
        if ((Cash1 == Empty) && (Cash2 != Empty) || (cointoss == 1) )
        {
            Cash1 = Full;
            queue--;

            switch ((rand()%2))
            {
                case 0:
                    Cash1Salad = rand()% 66 + 55;
                    totalWait = totalWait + Cash1Salad;
                    Empty1 = Cash1Salad;
                    CustomersServed++;
                    break;
                case 1:
                    Cash1Buger = rand()% 130 + 111;
                    totalWait = totalWait + Cash1Buger;
                    Empty1 = Cash2Burger;
                    CustomersServed++;
                    break;
            }
        }

        /* Cash 1 is busy cash 2 is open customer goes to cash 2 and chooses what they want */
        else if (Cash2 = Empty)
        {
            Cash2 = Full;
            queue--;

            switch ((rand()%2))
            {
                case 0:
                    Cash2Salad = rand()% 75 + 65;
                    totalWait = totalWait + Cash2Salad;
                    Empty2 = Cash2Salad;
                    CustomersServed++;
                    break;
                case 1:
                    Cash2Burger = rand()% 140 + 121;
                    totalWait = totalWait + Cash2Burger;
                    Empty2 = Cash2Burger;
                    CustomersServed++;
                    break;
            }
        }

        /*Both cashes are busy so the customer has to wait until one cash opens */
        else
        {
            totalWait++;
            waitingCustomers++;

        }

        /*Clearing Cash 1 if someone went there */
        if (Empty1 > 0)
        {
            Empty1--;
        }
        /*empty1 is equal to 0 then cash 1 is empty */
        else
        {
            Cash1 = Empty;
        }
        /*Clearing cash 2 is someone went there */
        if (Empty2 > 0)
        {
            Empty2--;
        }
        /*empty2 is equal to 0 then cash 2 is empty */
        else
        {
            Cash2 = Empty;
        }
     }
    }
    else
    {
        /*nothing happens because no customer showed up */
    }

}

intervalNumber++;

AverageWait = ((totalWait*1.0)/ (totalCustomers));
printf ("The average waiting time per customer in seconds is %0.2f in the interval      %d\n\n", AverageWait, intervalNumber);

printf  ("The total customers that arrived in the interval %d is %d\n\n", intervalNumber, totalCustomers);

}


int main (void)
{
    float CustomersPerMinute;

    printf ("Enter in the number of customers you want to arrive per minute:\n");
    scanf ("%f", &CustomersPerMinute);

    ChanceOfArrival(CustomersPerMinute);


    return 0;
}

嗨，我有這個程序，假設模擬一個只供應沙拉或漢堡的餐廳，只有兩個收銀員，只有一個排隊，客戶可以排隊等候送達。

我不確定為什么它不起作用但是因為我認為一切都具有邏輯意義，但是當我運行這個程序時，它只打印出平均等待時間。

但問題是每個間隔打印的平均等待時間是相同的。 這不是我想要的。

從邏輯上講，我認為每個時間間隔的平均等待時間應該不同，因為客戶是隨機生成的。 然而事實並非如此，因為平均等待時間總是相同的，我該如何解決這個問題呢？

由於客戶是隨機生成的，因此每個時間間隔的客戶總數是相同的，因為客戶是隨機生成的，我該如何解決這個問題呢？

Answer 1

看起來你正在循環srand。 所以它可能會在給定的秒內給你相同的rand（）結果。 堆棧溢出不是一個debuging論壇雖然;）。