#define  gre 7
#define  LDR 5

void setup() {
  
 
  pinMode(gre, OUTPUT);
  pinMode(LDR, INPUT);
}

void loop() {
  
   // put your main code here, to run repeatedly:
  int inp;
   inp=digitalRead(LDR);
    if(inp==HIGH)
    digitalWrite(gre, HIGH);
  
  else
  
    digitalWrite(gre, LOW);

}