examExample1

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(){
}