I am assuming that user_val is an inputted variable and a whole number (int)...
user_val = int(input("Enter a number: "))
if user_val < 0:
print("negative")
else:
print("non-negative")
The shell of an operating system is the programming that interprets the commands and actions of the user of the system.
Answer:
A target audience is the demographic of people most likely to be interested in your product or service. For example if you own a plumbing company, the target audience is property owners, both commercial and residential.