Let's say we are calculating the volume of a grain silo where the the width is a constant, but the height can be changed.
In our code we would calculate the volume using something like:
PI * (WIDTH / 2)^2 * height
The variables in all caps would be named constants. Using them makes the code more readable to other people than if we were to just use their values like:
We can connect a temperature sensor connected to the water and a heater or cooler sensor, we have created a program to check the temperature from the sensor.
when the water is hotter than recommended, we turn on the refrigerator and when it is cold, we turn on the heater
so correct answer is water temperature gauge sensor
