Multiplication of two int's gets negative

Question

I\'m currently coding a little download manager and I get a funny output when I try to calculate the download-progress in percent. This is what i use to calculate it:

Answer 1

21476160 * 100 = 2 147 616 000 is greater than 2 147 483 647, the max int.

You're overflowing.

Use long for your calculations.