int a=21;//green
int b=19;// orange
int c=13;//rose
int d=12;//yellow
int e=14;//white
int f=27;//blue
int g=26;//gray

void setup(){
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
}
 void loop (){
  // for 0
  digitalWrite( a ,LOW);
  digitalWrite( b ,LOW);
  digitalWrite( c ,LOW);
  digitalWrite( d ,LOW);
  digitalWrite( e ,LOW);
  digitalWrite( f ,LOW);
  digitalWrite( g , HIGH);
 delay(1000);

 // for 1
digitalWrite( a ,HIGH);
  digitalWrite( b ,LOW);
  digitalWrite( c ,LOW);
  digitalWrite( d ,HIGH);
  digitalWrite( e ,HIGH);
  digitalWrite( f ,HIGH);
  digitalWrite( g , HIGH);
delay(1000);

//for 2
digitalWrite( a , 0 ); // 1==high , 0==low
digitalWrite( b ,  0);
digitalWrite( c ,  1);
digitalWrite( d ,  0);
digitalWrite( e ,  0);
digitalWrite( f , 1 );
digitalWrite( g,  0);
delay(1000);

//for 3
digitalWrite( a ,0  );
digitalWrite( b , 0 );
digitalWrite( c , 0 );
digitalWrite( d , 0 );
digitalWrite( e , 1 );
digitalWrite( f , 1 );
digitalWrite( g,  0 );
delay(1000);

//for 4
digitalWrite( a , 1 );
digitalWrite( b , 0 );
digitalWrite( c , 0 );
digitalWrite( d , 1 );
digitalWrite( e , 1 );
digitalWrite( f , 0 );
digitalWrite( g,  0);
delay(1000);

//for 5
digitalWrite( a , 0 );
digitalWrite( b , 1 );
digitalWrite( c , 0 );
digitalWrite( d , 0 );
digitalWrite( e , 1 );
digitalWrite( f , 0 );
digitalWrite( g, 0 );
delay(1000);

//for 6
digitalWrite( a , 0 );
digitalWrite( b , 1 );
digitalWrite( c , 0 );
digitalWrite( d , 0);
digitalWrite( e , 0);
digitalWrite( f , 0 );
digitalWrite( g, 0 );
delay(1000);


//for 7
digitalWrite( a , 0 );
digitalWrite( b , 0 );
digitalWrite( c ,  0);
digitalWrite( d , 1 );
digitalWrite( e , 1 );
digitalWrite( f , 1 );
digitalWrite( g, 1 );
delay(1000);

//for 8
digitalWrite( a , 0 );
digitalWrite( b , 0 );
digitalWrite( c , 0 );
digitalWrite( d , 0 );
digitalWrite( e , 0 );
digitalWrite( f , 0 );
digitalWrite( g,  0);
delay(1000);

  //for 9
digitalWrite( a , 0 );
digitalWrite( b , 0 );
digitalWrite( c , 0 );
digitalWrite( d , 1 );
digitalWrite( e , 1 );
digitalWrite( f , 0 );
digitalWrite( g,  0);
delay(1000);

 }