7-segment display

int a=7; 

int b=6; 

int c=5; 

int d=11; 

int e=10; 

int f=8; 

int g=9; 

int dp=4; 

//display number 1

void display1(void) 

{ 

    digitalWrite(b,HIGH);

    digitalWrite(c,HIGH);

} 

//display number2

void display2(void) 

{

    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);

    digitalWrite(g,HIGH);

  digitalWrite(e,HIGH);

    digitalWrite(d,HIGH);

} 

// display number3

void display3(void) 

{ 

    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);

  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);

    digitalWrite(g,HIGH);

} 

// display number4

void display4(void) 

{ 

    digitalWrite(f,HIGH);

    digitalWrite(b,HIGH);

    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);

} 

// display number5

void display5(void) 

{ 

    digitalWrite(a,HIGH);

    digitalWrite(f,HIGH);

    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);

} 

// display number6

void display6(void) 

{ 

    digitalWrite(a,HIGH);

    digitalWrite(f,HIGH);

    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);  

    digitalWrite(e,HIGH);  

} 

// display number7

void display7(void) 

{   

   digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);

    digitalWrite(c,HIGH);

} 

// display number8

void display8(void) 

{ 

    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);

    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);  

    digitalWrite(e,HIGH);  

  digitalWrite(f,HIGH);  

} 

void clearDisplay(void) 

{ 

    digitalWrite(a,LOW);

    digitalWrite(b,LOW);

    digitalWrite(g,LOW);

  digitalWrite(c,LOW);

    digitalWrite(d,LOW);  

    digitalWrite(e,LOW);  

  digitalWrite(f,LOW);  

} 

void display9(void) 

{ 

    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);

    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);  

  digitalWrite(f,HIGH);  

} 

void display0(void) 

{ 

    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);

  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);  

    digitalWrite(e,HIGH);  

  digitalWrite(f,HIGH);  

} 

void setup() 

{ 

    int i;

    for(i=4;i<=11;i++) 

        pinMode(i,OUTPUT);

} 

void loop() 

{     

    while(1) 

    {   clearDisplay();

  display0(); 

        delay(2000); 

        clearDisplay();

        display1(); 

        delay(2000); 

        clearDisplay();

        display2(); 

        delay(2000); 

        clearDisplay();

        display3(); 

        delay(2000);

        clearDisplay();

        display4(); 

        delay(2000);

        clearDisplay(); 

        display5(); 

        delay(2000);

        clearDisplay(); 

        display6(); 

        delay(2000);

        clearDisplay(); 

        display7(); 

        delay(2000); 

        clearDisplay();

        display8(); 

        delay(2000); 

        clearDisplay();  

        display9(); 

        delay(2000);      

    }

}