int a=7; 
int b=6; 
int c=5; 
int d=12; 
int e=10; 
int
  f=8; 
int g=9; 
int dp=4; 
int sw3=3;
//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);
        pinMode(sw3, INPUT);
} 
void loop() 
{     
    if(digitalRead(sw3)==0)

    {   clearDisplay();
  display0(); 
        delay(500); 
        clearDisplay();

        display1(); 
        delay(500); 
        clearDisplay();
        display2();
  
        delay(500); 
        clearDisplay();
        display3(); 

        delay(500);
        clearDisplay();
        display4(); 
        delay(500);

        clearDisplay(); 
        display5(); 
        delay(500);
        clearDisplay();
  
        display6(); 
        delay(500);
        clearDisplay(); 

        display7(); 
        delay(500); 
        clearDisplay();
        display8();
  
        delay(500); 
        clearDisplay();  
        display9(); 

        delay(500);      
    }
    else
    {
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);

      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);

      digitalWrite(e, HIGH);
      digitalWrite(f, HIGH);
      digitalWrite(g, LOW);

    }
}