TOPIC-PYTHON

In the below code why r=0 and please explain r=r*10+d

s=int (input("Enter any number:"))
r=0
while (s>0):
d=s%10
r=r*10+d
s=s//10
print ("reverse",r)

Select the correct answer. a company wants to use online methods to target more customers. it decides to conduct a market research by collecting the data of a few customers with their consent. they want to track data of the sites that their customers frequently visit. which software can the company? a. spyware b. bots c. adware d. trojan horse e. rootkits