I wish to know that how promo code works. What type of language used to make a promo code and how it is known that the code is expired or not.
Promo codes are the codes given by developers to promote on google play to use it freely
Like for instance I'm going to buy a course on udemy or buy something on e-commerce site. During checkout there is an option of applying coupons. I'm talking about that coupons. How they help in a discount or in for free. How these things work.
://promo code can you please explain it more
Why won't my image display
I have made a calculator in which my % (Percentage) not work correctly for 100%50 or 100%20.
Number of Ones ( C++ ) question!
Python palindrome challenge.