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Ruby Ruby Operators and Control Structures Logical Operators The And (&&) Operator

Posted by Dewi Tjin
Dewi Tjin
2,275 Points

if else statement is wrong...

I don't know why this won't pass..

  def check_speed(car_speed)
  # write your code here
  if (car_speed == 40) && (car_speed == 50) && (car_speed < 50)
  puts "safe"
  end

3 Answers

giovannialvarez
giovannialvarez
6,487 Points

OK now I understand. The problem you're having is the grouping of these conditionals. There is an order of operations that takes place that I won't get into but basically you can treat conditionals like an algebra equation.

So

def check_speed(car_speed)
  # write your code here
  if (car_speed > 40) && ( car_speed < 50) || (car_speed == 40) || (car_speed == 50)
  puts "safe"

end

Becomes

def check_speed(car_speed)
  # write your code here
  if ((car_speed > 40) && (car_speed < 50)) || ((car_speed == 40) || (car_speed == 50))
  puts "safe"

end
giovannialvarez
giovannialvarez
6,487 Points

Like @Maciej says you could also use <= >= for readability

Dewi Tjin
Dewi Tjin
2,275 Points

Almost worked.. missing another end.. thanks!!!

def check_speed(car_speed)
  # write your code here
  if ((car_speed > 40) && (car_speed < 50)) || ((car_speed == 40) || (car_speed == 50))
  "safe"
  end
end

and this would work too:

def check_speed(car_speed)
  # write your code here
  if (car_speed >= 40) && (car_speed <= 50)
  "safe"
  end
end
giovannialvarez
giovannialvarez
6,487 Points
giovannialvarez
giovannialvarez
6,487 Points

Because car_speed can't be equal to 40 AND 50 at the same time, also car_speed can't be 50 AND less than 50 at the same time

Dewi Tjin
Dewi Tjin
2,275 Points

Sorry, made a mistake.. okay I changed the code but this still doesn't work..

  def check_speed(car_speed)
  # write your code here
  if (car_speed > 40) && ( car_speed < 50) || (car_speed == 40) || (car_speed == 50)
  puts "safe"

end
Maciej Czuchnowski
Maciej Czuchnowski
36,441 Points
Maciej Czuchnowski
Maciej Czuchnowski
36,441 Points

You need the following things:

1) add another end after the if` statement

2) remove puts - they want you to return the string, not print it.

3) try using <= and >= operators to make the statement more readable and shorter