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 (in Python-like pseudocode)
# Input: Get the current outside pressure from the user
pressure = float(input("Enter the current outside pressure in ATM: "))
# Decision-making based on pressure range
if pressure > 0.75 and pressure <= 1:
print("Turn on the light.")
elif pressure <= 0.75:
print("Sound the warning signal.")
else:
print("No action is required.")
Explanation
The problem describes a control system for a house that responds to atmospheric pressure with either a light or a warning signal, depending on the pressure value. Specifically, the light should turn on if the pressure is between 0.75 and 1 atmospheres (exclusive of 0.75 and inclusive of 1). If the pressure is 0.75 ATM or below, a warning signal should be triggered. Importantly, the light and sound must not be active at the same time, ensuring mutual exclusivity.
To address this, a simple program is written that reads the current outside pressure from the user using the input() function. The input is converted to a float, allowing for decimal values to be processed accurately.
The core logic lies in the conditional statements:
- The first condition (
if pressure > 0.75 and pressure <= 1) checks whether the pressure lies in the safe range. If true, the system turns on the light. - The
elifbranch checks whether the pressure is less than or equal to 0.75, which is considered unsafe. In that case, a warning signal is sounded. - The final
elsebranch is a fallback for pressure values greater than 1 ATM, where no action is needed, assuming higher pressures are not a concern for this system.
This solution uses simple branching to ensure the requirements are met. No simultaneous light and sound signals will be activated, because the conditions are mutually exclusive. The program also handles edge cases like exactly 0.75 ATM or above 1 ATM appropriately.
Solution (in Python-like pseudocode)
# Input: Get the current outside pressure from the user
pressure = float(input("Enter the current outside pressure in ATM: "))
# Decision-making based on pressure range
if pressure > 0.75 and pressure <= 1:
print("Turn on the light.")
elif pressure <= 0.75:
print("Sound the warning signal.")
else:
print("No action is required.")
This solution uses simple branching to ensure the requirements are met. No simultaneous light and sound signals will be activated, because the conditions are mutually exclusive. The program also handles edge cases like exactly 0.75 ATM or above 1 ATM appropriately.
