int a = 15; //Arduino pins connected with 7 segment pins      
int b = 2; 
int c = 4; 
int d = 5; 
int e = 18; 
int f = 19; 
int g = 21;
void setup() {
//Declaring all the pins as output  
pinMode(a, OUTPUT); pinMode(b, OUTPUT);pinMode(c, OUTPUT);
pinMode(d, OUTPUT);pinMode(e, OUTPUT); pinMode(f, OUTPUT);
pinMode(g, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(a, HIGH);
 digitalWrite(b, HIGH);
 digitalWrite(c, HIGH);
 digitalWrite(d, HIGH);//Generating 1
 digitalWrite(e, LOW);
 digitalWrite(f, LOW);
 digitalWrite(g, HIGH);
 delay(1000);  // wait for a second
 digitalWrite(a, LOW);
 digitalWrite(b, LOW);
 digitalWrite(c, HIGH); //Generating 2
 digitalWrite(d, LOW);
 digitalWrite(e, LOW);
 digitalWrite(f, HIGH);
 digitalWrite(g, LOW);
 delay(1000); // wait for a second
 digitalWrite(a, LOW);
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW); //Generating 3
 digitalWrite(e, HIGH);
 digitalWrite(f, HIGH);
 digitalWrite(g, LOW);
 delay(1000);// wait for a second
 digitalWrite(a, HIGH);
 digitalWrite(b, LOW);

 digitalWrite(c, LOW);
 digitalWrite(d, HIGH);
 digitalWrite(e, HIGH); //Generating 4
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
 delay(1000);  // wait for a second
 digitalWrite(a, LOW);
 digitalWrite(b, HIGH);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, HIGH); //Generating 5
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
 delay(1000);  // wait for a second
 digitalWrite(a, LOW);
 digitalWrite(b, HIGH);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW); //Generating 6
 digitalWrite(e, LOW);
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
 delay(1000);  // wait for a second
 digitalWrite(a, LOW);
 digitalWrite(b, LOW); digitalWrite(c, LOW);
 digitalWrite(d, HIGH);
 digitalWrite(e, HIGH);  //Generating 7
 digitalWrite(f, HIGH); digitalWrite(g, HIGH);
 delay(1000);  // wait for a second  digitalWrite(a, LOW );
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, LOW);  //Generating 8
 digitalWrite(f, LOW); digitalWrite(g, LOW);
 delay(1000);  // wait for a second
 digitalWrite(a, LOW);
 digitalWrite(b, LOW); digitalWrite(c, LOW);
 digitalWrite(d, HIGH);
 digitalWrite(e, HIGH); //Generating 9
 digitalWrite(f, LOW);

 digitalWrite(g, LOW);
 delay(1000);  // wait for a second
}