Seven Segment RNG with Buzzer

1int a = 2, b = 3, c = 4, d = 5, e = 6, f = 7, g = 8, buzzerPin = 10, buttonPin  = 9, rn; //Declares all the variables
2
3void setup() { //Sets the pinmode
4  pinMode(a, OUTPUT);
5  pinMode(b, OUTPUT);
6  pinMode(c, OUTPUT);
7  pinMode(d,  OUTPUT);
8  pinMode(e, OUTPUT);
9  pinMode(f, OUTPUT);
10  pinMode(g, OUTPUT);
11  pinMode(buzzerPin, OUTPUT);
12  pinMode(buttonPin, INPUT);
13
14  Serial.begin(9600);
15}
16
17void  loop() { 
18  if(digitalRead(buttonPin) == HIGH){ //Generates random number, matches  the number with the seven segment display function, and runs the shuffle loop 20  times when the button is pressed
19    for(int ctr = 0; ctr < 20; ctr++){ 
20      rn = random(10);
21      if(rn == 0){
22        zero();
23        tone(buzzerPin,  523);
24      }
25      if(rn == 1){
26        one();
27        tone(buzzerPin,  587);
28      }
29      if(rn == 2){
30        two();
31        tone(buzzerPin,  659);
32      }
33      if(rn == 3){
34        three();
35        tone(buzzerPin,  698);
36      }
37      if(rn == 4){
38        four();
39        tone(buzzerPin,  784);
40      }
41      if(rn == 5){
42        five();
43        tone(buzzerPin,  880);
44      }
45      if(rn == 6){
46        six();
47        tone(buzzerPin,  988);
48      }
49      if(rn == 7){
50        seven();
51        tone(buzzerPin,  1047);
52      }
53      if(rn == 8){
54        eight();
55        tone(buzzerPin,  1175);
56      }
57      if(rn == 9){
58        nine();
59        tone(buzzerPin,  1319);
60      }
61      delay(75);
62      noTone(buzzerPin);
63    }
64  }
65}
66
67void  off() { //Turnes off the seven segmant display
68  digitalWrite(a, LOW);
69  digitalWrite(b,  LOW);
70  digitalWrite(c, LOW);
71  digitalWrite(d, LOW);
72  digitalWrite(e,  LOW);
73  digitalWrite(f, LOW);
74  digitalWrite(g, LOW);
75}
76
77void zero()  { //Displays a zero on the seven segment display
78  digitalWrite(a, HIGH);
79  digitalWrite(b, HIGH);
80  digitalWrite(c, HIGH);
81  digitalWrite(d, HIGH);
82  digitalWrite(e, HIGH);
83  digitalWrite(f, HIGH);
84  digitalWrite(g, LOW);
85}
86
87void  one() { //Displays a one on the seven segment display
88  digitalWrite(a, LOW);
89  digitalWrite(b, HIGH);
90  digitalWrite(c, HIGH);
91  digitalWrite(d, LOW);
92  digitalWrite(e, LOW);
93  digitalWrite(f, LOW);
94  digitalWrite(g, LOW);
95}
96
97void  two() { //Displays a two on the seven segment display
98  digitalWrite(a, HIGH);
99  digitalWrite(b, HIGH);
100  digitalWrite(c, LOW);
101  digitalWrite(d, HIGH);
102  digitalWrite(e, HIGH);
103  digitalWrite(f, LOW);
104  digitalWrite(g, HIGH);
105}
106
107void  three() { //Displays a three on the seven segment display
108  digitalWrite(a, HIGH);
109  digitalWrite(b, HIGH);
110  digitalWrite(c, HIGH);
111  digitalWrite(d, HIGH);
112  digitalWrite(e, LOW);
113  digitalWrite(f, LOW);
114  digitalWrite(g, HIGH);
115}
116
117void  four() { //Displays a four on the seven segment display
118  digitalWrite(a, LOW);
119  digitalWrite(b, HIGH);
120  digitalWrite(c, HIGH);
121  digitalWrite(d, LOW);
122  digitalWrite(e, LOW);
123  digitalWrite(f, HIGH);
124  digitalWrite(g, HIGH);
125}
126
127void  five() { //Displays a five on the seven segment display
128  digitalWrite(a, HIGH);
129  digitalWrite(b, LOW);
130  digitalWrite(c, HIGH);
131  digitalWrite(d, HIGH);
132  digitalWrite(e, LOW);
133  digitalWrite(f, HIGH);
134  digitalWrite(g, HIGH);
135}
136
137void  six() { //Displays a six on the seven segment display
138  digitalWrite(a, HIGH);
139  digitalWrite(b, LOW);
140  digitalWrite(c, HIGH);
141  digitalWrite(d, HIGH);
142  digitalWrite(e, HIGH);
143  digitalWrite(f, HIGH);
144  digitalWrite(g, HIGH);
145}
146
147void  seven() { //Displays a seven on the seven segment display
148  digitalWrite(a, HIGH);
149  digitalWrite(b, HIGH);
150  digitalWrite(c, HIGH);
151  digitalWrite(d, LOW);
152  digitalWrite(e, LOW);
153  digitalWrite(f, LOW);
154  digitalWrite(g, LOW);
155}
156
157void  eight() { //Displays an eight on the seven segment display
158  digitalWrite(a,  HIGH);
159  digitalWrite(b, HIGH);
160  digitalWrite(c, HIGH);
161  digitalWrite(d,  HIGH);
162  digitalWrite(e, HIGH);
163  digitalWrite(f, HIGH);
164  digitalWrite(g,  HIGH);
165}
166
167void nine() { //Displays a nine on the seven segment display
168  digitalWrite(a, HIGH);
169  digitalWrite(b, HIGH);
170  digitalWrite(c, HIGH);
171  digitalWrite(d, HIGH);
172  digitalWrite(e, LOW);
173  digitalWrite(f, HIGH);
174  digitalWrite(g, HIGH);
175}