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//Please first, open new code page (new sketch) from Arduino IDE
//Copy the following code and paste it into the new sketch
//Then save and verify
 
int sound_sensor= 4;
int relay= 5;
int clap= 0;
long detection_range_start = 0;
long detection_range = 0;
boolean status_lights = false;
 
const int motor1Pin = 3;    // H-bridge leg 1 (pin 2, 1A)
const int motor2Pin = 6;  // H-bridge leg 2 (pin 7, 2A)
 
void setup() {
  pinMode(sound_sensor, INPUT);
  pinMode(relay, OUTPUT);
  pinMode(motor1Pin, OUTPUT);
  pinMode(motor2Pin, OUTPUT);
 pinMode(12, OUTPUT);
  Serial.begin  (9600);
}
 
void loop() {
 
  int status_sensor = digitalRead(sound_sensor);
 
  if (status_sensor == 0)
  {
    if (clap == 0)
    {
      detection_range_start = detection_range = millis();
      clap++;
    }
    else if (clap > 0 && millis()-detection_range >= 50)
    {
      detection_range = millis();
      clap++;
    }
  }
 
  if (millis()-detection_range_start >= 400)
  {
    if (clap == 1)
    {
      if (!status_lights)
        {
          status_lights = true;
          digitalWrite(relay, HIGH);
 
          digitalWrite(motor1Pin, HIGH);   // set leg 1 of the H-bridge low
          digitalWrite(motor2Pin, LOW);
         digitalWrite(12, HIGH);
        }
        else if (status_lights)
        {
          status_lights = false;
          digitalWrite(relay, LOW);
           digitalWrite(motor1Pin, LOW);   // set leg 1 of the H-bridge low
          digitalWrite(motor2Pin, LOW);
         digitalWrite(12, HIGH);
        }
    }
    clap = 0;
  }
}
 
// end code

prog.cpp:10:1: error: ‘boolean’ does not name a type
 boolean status_lights = false;
 ^~~~~~~
prog.cpp: In function ‘void setup()’:
prog.cpp:16:25: error: ‘INPUT’ was not declared in this scope
   pinMode(sound_sensor, INPUT);
                         ^~~~~
prog.cpp:16:30: error: ‘pinMode’ was not declared in this scope
   pinMode(sound_sensor, INPUT);
                              ^
prog.cpp:17:18: error: ‘OUTPUT’ was not declared in this scope
   pinMode(relay, OUTPUT);
                  ^~~~~~
prog.cpp:21:3: error: ‘Serial’ was not declared in this scope
   Serial.begin  (9600);
   ^~~~~~
prog.cpp: In function ‘void loop()’:
prog.cpp:26:47: error: ‘digitalRead’ was not declared in this scope
   int status_sensor = digitalRead(sound_sensor);
                                               ^
prog.cpp:32:56: error: ‘millis’ was not declared in this scope
       detection_range_start = detection_range = millis();
                                                        ^
prog.cpp:35:33: error: ‘millis’ was not declared in this scope
     else if (clap > 0 && millis()-detection_range >= 50)
                                 ^
prog.cpp:42:14: error: ‘millis’ was not declared in this scope
   if (millis()-detection_range_start >= 400)
              ^
prog.cpp:46:12: error: ‘status_lights’ was not declared in this scope
       if (!status_lights)
            ^~~~~~~~~~~~~
prog.cpp:49:31: error: ‘HIGH’ was not declared in this scope
           digitalWrite(relay, HIGH);
                               ^~~~
prog.cpp:49:35: error: ‘digitalWrite’ was not declared in this scope
           digitalWrite(relay, HIGH);
                                   ^
prog.cpp:52:35: error: ‘LOW’ was not declared in this scope
           digitalWrite(motor2Pin, LOW);
                                   ^~~
prog.cpp:58:31: error: ‘LOW’ was not declared in this scope
           digitalWrite(relay, LOW);
                               ^~~
prog.cpp:58:34: error: ‘digitalWrite’ was not declared in this scope
           digitalWrite(relay, LOW);
                                  ^
prog.cpp:61:27: error: ‘HIGH’ was not declared in this scope
          digitalWrite(12, HIGH);
                           ^~~~

Standard output is empty