const int led=7, button=3;
int   ValoreLed, Valorebutton;
boolean Verify;
void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(button, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:

ValoreLed=digitalRead(led);
Valorebutton=digitalRead(button);
delay (100);
if(Valorebutton==HIGH) Verify=!Verify;
if(Verify==true) digitalWrite(led, HIGH);
else digitalWrite(led, LOW);
}