This is a Tip Calculator. It's really basic as it's my first real project. I'm still learning JavaScript but it should get better with time.
Website: http://tipcalculator.brandonpretelt.com
Right now, it's only for smartphones. I'm planning to update it for tablets and desktop eventually.
The formula used in this tip calculator is from my math class. It helps to know a little math, to be honest.
The function tipCalc() does the formula and returns the value and allCalc does the heavy lifiting and puts everything in the appropriate divs.
init() function is self-explanatory.