person would like to install a device in his house which turns a light on when the pressure is between 0.75 and 1 atmospheres (ATM), and sounds a warning signal when the outside pressure is 0.75 ATM or below.

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person would like to install a device in his house which turns a light on when the pressure is between 0.75 and 1 atmospheres (ATM), and sounds a warning signal when the outside pressure is 0.75 ATM or below. The light and the sound will never go off simultaneously. Write a solution to this problem.
(Hint: Use the enter statement to input the present outside pressure. Print out what should happen, instead of actually turning on the light and the sign

The Correct Answer and Explanation is:

Solution (Python Code):

# Enter the current outside pressure
pressure = float(input("Enter the current outside pressure in ATM: "))

# Check the pressure and determine the appropriate action
if 0.75 < pressure <= 1.0:
    print("Turn ON the light.")
elif pressure <= 0.75:
    print("Sound the WARNING signal.")
else:
    print("No action required.")

Explanation

This problem involves designing a simple decision-based system that reacts to different ranges of atmospheric pressure. The user wants to install a device in their house that behaves in the following way:

  1. Turn on a light when the outside pressure is between 0.75 and 1.0 ATM, not including 0.75.
  2. Sound a warning signal when the outside pressure is 0.75 ATM or below.
  3. Never perform both actions at the same time.
  4. Do nothing when the pressure is above 1.0 ATM.

The Python solution uses an if-elif-else structure to implement this logic. First, the program uses input() to prompt the user to enter the current pressure value, which is then converted to a floating-point number for comparison.

  • The condition 0.75 < pressure <= 1.0 checks if the pressure is within the safe operating range. If so, the system prints a message indicating the light should be turned on.
  • The condition pressure <= 0.75 checks if the pressure is low enough to be considered dangerous. In that case, it prints a message to sound the warning signal.
  • The else clause covers all other cases, such as pressures above 1.0 ATM, where no action is needed.

This ensures that only one response occurs at any time and the behavior is consistent with the safety and alert requirements. The system could easily be connected to real sensors and actuators in a practical embedded system, but for now, this program simply prints the action to be taken, making it ideal for simulation or educational purposes.

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