What is hexadecimal

Question

I was doing a challenge on php and noticed something about bchexdec. Now if im not confused that would mean hexadecimal. Could someome please explain exactly what hexadecimal is and what decimal is for that matter?

Answer 1

Decimal are numbers of base 10, i.e. What you are familiar with.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11..

Hexadecimal are numbers of base 16.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11...

A hexadecimal value of C, would be 12 in decimal form.

A decimal number of 18, would be 12 in hexadecimal form.

Answer 2

Thanks Hatsy Rei!!
extremely helpful