smart parking system coding help needed

Projects Programming
12

Just saw your post,
Here's what i did yesterday.
I think it still has some issue with print.

  dist[0] = readsensor(trigPin3, echoPin3); // parking distance for p1

  dist[1] = readsensor(trigPin4, echoPin4); // p2
 
  dist[2] = readsensor(trigPin5, echoPin5);
 
  dist[3] = readsensor(trigPin6, echoPin6);

  bool slot[4];
  int i=0,j=0;
  for(i=0;i<4;i++){
    if (dist[i]>8){
    slot[i]=false;
    }
    else{
    slot[i]=true;
    }
  }

  const char*str;
  for(i=0;i<4;i++){
    if(slot[i]){
      str=strcat("P",(char*)i);
    }
  }
  strcat(str,"Are Free");
  lcd.setCursor(0,1);
  lcd.print(str);