void setup(){
Serial.begin(9600);
pinMode(13,OUTPUT);
Serial.println("enter a number");
while(Serial.available()==0);
int num = Serial.parseInt();
for( ; num%2==0; ){
digitalWrite(13,HIGH);
delay(500);
digitalWrite(13,LOW);
delay(500);
Serial.println("enter a number");
while(Serial.available()==0);
num = Serial.parseInt();
}
}
void loop(){
}
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