Question:
Hello. In the course of work, I had to check whether the last digit of the number is nine. While wrote the crutch
if(("" + num).endsWith("9"))
How can you check mathematically? Range [0, 99]
Answer:
For example, like this:
Math.abs(n) % 10 == 9
If you know for sure that the number is positive, you don't have to evaluate Math.abs .