What does a 0x
prefix on a number mean?
const int shared_segment_size = 0x6400;
It's from a C program. I can't recall what it amounts to and particularly what the letter x
means.
Literals that start with 0x
are hexadecimal integers. (base 16)
The number 0x6400
is 25600
.
6 * 16^3 + 4 * 16^2 = 25600
For an example including letters (also used in hexadecimal notation where A = 10, B = 11 ... F = 15)
The number 0x6BF0
is 27632
.
6 * 16^3 + 11 * 16^2 + 15 * 16^1 = 27632
24576 + 2816 + 240 = 27632