This is a simple one. Given the input of a number, return the name and reputation score of the Stack Overflow user with that given ID. Your program can assume that it is always given a valid and existent user ID.
For example: given the input
764357 (which is my userID on StackOverflow) the program would return
LegoStormtroopr 3,088 (approximately) it might change.
You get the URL: "https://stackoverflow.com/users/" or "http://api.stackexchange.com/2.1/users/" for free, so your score is
length of your program - 31 or 39, depending on which URL you use - but declare which it is. This prevents people from abusing URL shorteners.
edit: And no calling a custom made API that query Stack Overflow, and returns just the name and score.
But if you know of an offical API, then that is totally legitimate.
edit2: If you need an example input: I've given my ID below, feel free to add your own ID, username and score below to help others out. Note again, this is for the main Stack Overflow site.
764357 returns LegoStormtroopr 3,088