Pointy
From Esolang
Pointy is a language by Ihope127. The basic datatype is the pointer.
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[edit] Instructions
The instructions:
LBL foo: not really an instruction, but marks a destination for a DEC jump. CPY x y: stores the value x in memory location y. INC x: increments the value at memory location x. DEC x foo: tries to decrement the value at memory location x. If x already held 0, jumps to foo. OUT x: outputs x. INP x: inputs a value into the memory location x.
Pointers can be dereferenced using the * operator: *x is the value at location x. Since there is a memory location 0 (there is no null pointer), * never fails to produce a result.
[edit] Examples
Hello, World!
CPY 108 1 CPY 111 2 OUT 72 OUT 101 OUT *1 OUT *1 OUT *2 OUT 44 OUT 32 OUT 119 OUT *2 OUT 114 OUT *1 OUT 100 OUT 33
Cat program
LBL start INP 0 OUT *0 DEC 1 start ; the value at 1 will be 0, so this jumps to start
[edit] Computational class
Pointy is Turing-complete because it can simulate a Minsky machine. It can also emulate Brainfuck with a tape that extends infinitely only to the right.
