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[–] mikwaheeri 0 points 2 points (+2|-0) ago 

One simple idea that I like is writing a little program to open commonly used files instead of manually navigating and double clicking. It touches on basic GUI use (creating a window & some buttons) as well as using built-in OS operations. This obviously doesn't cover a very wide range of features, but still could prove somewhat useful if expanded upon.

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[–] codioBunny 0 points 1 point (+1|-0) ago 

Similar to tic-tac-toe, writing Blackjack is also a good one. You can make it as simple or complex as you like: start off with just text-based and then create a UI for it.

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[–] captbrogers 0 points 1 point (+1|-0) ago 

It's a great question but there is a caveat to it: what platform are you aiming at?

Which of the following applies:

  • desktop OS application
  • desktop website (non-mobile interface)
  • mobile website (geared specifically at low-bandwidth and small screen)
  • mobile application (native)
  • mobile application (non-native, e.g. uses HTML/CSS/JS instead of Objective C/Java)

Here are my two credits worth of thoughts on each.

On the desktop I'd go for a calculator. It can be as simple as basic arithmetic to more advanced features like graphing output on a formula using a GUI library.

A website, either desktop or mobile, do a blog. Not just any blog, but one written using object-oriented code. Do role-based permissions, repository patterns, events, JSON (or XML) API, handling uploads, etc. Can be done with or without a framework.

Mobile apps I'm not really well versed on a concept that would be great to cover basics of each. For that, someone else will have to chime in.

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[–] kuda ago 

I usually write a database-backed and/or file system backed to-do list application to learn a new language. Usually, 60 minutes is more than enough. If there's plenty of time, also add user login feature, so there will be different list for different user.

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[–] TelescopiumHerscheli ago 

I usually do two things after "Hello, World". First, I check that I can perform simple mathematical operations. Second, I check that I can open files, read from them and write to them.

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[–] wunderlust ago 

Writing a basic infix to postfix converter, or a small calculator. A lot of string manipulation, function modularity, file I/O, basic dictionary/array data structures.

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[–] spiraldancing [S] ago 

Found it. Here's what I was looking for ... rosetta code.