12. Process Sensor Reading

Your firmware processes a sensor reading in two different ways depending on whether the value is allowed to be modified or must be treated as read-only.

You must create two overloaded functions named process that differ only by const-correctness:

• If a reading is non-negative, the modifying overload must be used.
  • This overload must double the sensor value.
• If a reading is negative, the read-only overload must be used.
  • This overload must print "readonly" and must not modify the value.

You must use function overloading with const and non-const references.
Do not merge both behaviors into a single function.

In main():

• Read an integer x
• If x < 0, call the read-only overload
• Otherwise, call the modifying overload
• After modification, print the updated value
   

Example 1

Input:

5

Output:

10

Example 2

Input:

-3

Output:

readonly

Constraints:

• Two overloaded versions of the process must exist
• One overload must accept a non-const reference
• One overload must accept a const reference

The read-only overload must not modify the input