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int led_pin = 13;
 
void setup() {
  // put your setup code here, to run once:
  pinMode(led_pin, OUTPUT);
}
 
void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(led_pin, HIGH);
  delay(1000);
  digitalWrite(led_pin, LOW);
  delay(1000);
}

prog.cpp: In function 'void setup()':
prog.cpp:5:20: error: 'OUTPUT' was not declared in this scope
   pinMode(led_pin, OUTPUT);
                    ^
prog.cpp:5:26: error: 'pinMode' was not declared in this scope
   pinMode(led_pin, OUTPUT);
                          ^
prog.cpp: In function 'void loop()':
prog.cpp:10:25: error: 'HIGH' was not declared in this scope
   digitalWrite(led_pin, HIGH);
                         ^
prog.cpp:10:29: error: 'digitalWrite' was not declared in this scope
   digitalWrite(led_pin, HIGH);
                             ^
prog.cpp:11:13: error: 'delay' was not declared in this scope
   delay(1000);
             ^
prog.cpp:12:25: error: 'LOW' was not declared in this scope
   digitalWrite(led_pin, LOW);
                         ^

Standard output is empty