SimpC
The C like statements are interpreted by JavaScript, right in the
browser. It's really simplistic. It only supports
int and pointers to int (arbitrary number of
them). There is no concept of if/for, no
functions, no structs.
The aim is to understand pointers, not build a C interpreted in the browser :)
Memory representation
If you enable "Show raw bits", you will see how int and
pointers are usually stored in memory. int are stored as
two's complement (have a look at -1), and pointers are just
positive numbers all the time, so they are just a binary number
corresponding to the memory cell.