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#include <stdio.h>
1		#include <stdio.h>
2		#include <stdlib.h>
3		#include <time.h>
4		#define TRUE 1
5		#define FALSE 0
6
7		int main(void)
8		{
9		int selection;
10
11		printf("~~ FAST FOOD RESTARAUNT SIMULATION ~~\n\nPress 1 to initialize scenario 1. \nPress 2 to initialize scenario 2. \nPress any other key to exit the program.\n\nSelection: ");
12		scanf("%d",&selection);
13
14		switch(selection)
15		{
16		case 1:
17		scenarioOne();
18		break;
19		case 2:
20		scenarioTwo();
21		break;
22		default:
23		break;
24		}
25		return 0;
26		}
27
28		int scenarioOne(void)
29		{
30		printf("SCENARIO ONE CHOSEN.\n\n");
31
32		/// USER DEFINES CUSTOMERS PER MINUTE
33		double r;
34		printf("Define 'r' customers that'll show up per minute: ");
35		scanf("%lf",&r);
36
37		/// CUSTOMERS PER SECOND
38		double customerArrive; // the chance a customer will arrive at any given second
39		customerArrive=(r*1.0)/60;
40		printf("Theoretically, there will be %f customers arriving per second.\n Press 'Enter' to continue.\n",customerArrive);
41
42		getchar();
43		getchar();
44
45		/// EACH ITERATION IS A 10-MINUTE INTERVAL
46		int i;
47		for (i=0; i<18; i++)
48		interval(customerArrive);
49		}
50
51		int interval(double customerArrive)
52		{
53		int totalCustomer=0; // total # of customers
54		int totalWait=0; // total wait time
55		int avgWait=0; // AVERAGE wait time
56
57		int queue=0; // length of queue
58
59		int cash1empty=1; // whether or not a customer can get served by cash 1
60		int cash2empty=1; // whether or not a customer can get served by cash 2
61
62		int cash1salad,cash1burger,cash2salad,cash2burger; // different types of orders
63
64		/// EACH ITERATION IS ONE SECOND
65		int t;
66		for (t=0;t<600;t++)
67		{
68		/// Generate random value between 0 and 1.
69		double x;
70		x= (double) rand() / (double) RAND_MAX;
71
72		if (customerArrive>=x)
73		{
74
75		// A customer arrived during this second!
76		totalCustomer++;
77
78		// if both cashiers are empty, then it is 50/50 to decide where to go
79	-	if ((cash1empty==TRUE)\|\|(cash2empty==TRUE))
79	+	if ((cash1empty==TRUE)&&(cash2empty==TRUE))
80		{
81		switch((rand()%2))
82		{
83		case 0:
84		cash1empty=FALSE;
85		break;
86		case 1:
87		cash2empty=FALSE;
88		break;
89
90		}
91		}
92
93		if (cash1empty==TRUE)
94		{
95		cash1empty=FALSE;
96
97		switch((rand()%2))
98		{
99		case 0:
100		cash1salad=(rand()%(66-55)+55);
101		totalWait+=cash1salad;
102		break;
103		case 1:
104		cash1burger=(rand()%(131-111)+111);
105		totalWait+=cash1burger;
106		break;
107		}
108		}
109		else if (cash2empty=TRUE)
110		{
111		cash2empty=FALSE;
112
113		switch(rand()%2)
114		{
115		case 0:
116		cash2salad=(rand()%(76-65)+65);
117		totalWait+=cash2salad;
118		break;
119		case 1:
120		cash2burger=(rand()%(141-121)+121);
121		totalWait+=cash2burger;
122		break;
123		}
124		}
125		else
126		{
127		queue++;
128		/// I DON'T KNOW WHAT I'M DOING.
129		}
130
131		}
132		else
133		{
134		/// DO NOTHING
135		// A customer did not arrive during this second.
136		}
137		}
138
139
140		/// extra code: just to check
141		// Counter to determine which interval is currently running.
142		static int intNum;
143		intNum++;
144
145
146		/// extra code: just to check
147		// customer arrival rate per minute, by probability
148		double R;
149		R=(totalCustomer*1.0)/600;
150		printf("Customers arriving per minute in interval %d: %f\n",intNum,R);
151
152
153		avgWait=((totalWait*1.0)/(totalCustomer));
154		printf("Average wait time per customer: %d\n",avgWait);
155
156		/// extra code : just to check
157		printf("queue=%d\n\n",queue);
158
159		}