Java计算奇怪的结果

Question

This is the calculation I want my app to calculate:

100000000*90/100

Expected result: 90000000

Javas result: 4100654

Why is it doing this? The first number (100000000) is coming from an int array and its written into a textView.

Im trying to get 90% of 100000000.

I tried the following:

    long test123 = 100000000*90/100;
    Log.i("test123", String.valueOf(test123));

Answer 1

If you want to do this operation you should use long or multiply by 90L that will force answer to be a long. As @Nicolas pointed out by doing 100000000 * 90 you hit max int value hence the result.