7 segment + IR

Hello everyone
I have a programming for a scalectric timer(stopwatch), I see the programming on the arduino monitor, now I would like to be able to send that information to 4 leds of 7 segments, someone could tell me how it is done because I still do not study that part.
The LEDs I already have connected are common, digits 10.11.12.13 and 2.3.4.5.6.7.8.9 is ok
I enclose the schedule for testing.

/*Beaver's Hobby Channel Easy Arduino Project #2: Super simple lap timer
What you need:

  1. Arduino of your choice
  2. IR Obstacle Avoidance sensor (FC-51)
    */
    double i = 0;
    double a = millis();
    double c ;
    //int lap = 0;

void setup()
{
Serial.begin(9600);

pinMode(A0, INPUT);
digitalWrite(A0, HIGH);
}

void loop()
{
delay(10);
if(digitalRead(A0) == LOW)
{
c = millis();
i = (c - a) / 1000;
if(i > 1)
{
/* lap++;
Serial.print("Lap: ");
Serial.print(lap);
*/ // Serial.print("\t\t");
Serial.println(i);
a = millis();

}
}
}

matitatensis:
someone could tell me how it is done because I still do not study that part.

Why don't you study it and come back with proposed code if you need help? there are tons of information out there for that

PS/ also read the forum rules