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Paradigm(s) imperative
Designed by User:EZ132
Appeared in 2021
Memory system register based
Computational class Unknown
Reference implementation Unimplemented
File extension(s) .prg, .preg, .proreg

PREG is a register-based programming language.


The data structure of PREG is an array of registers, initially at zero. Each register is indexed by a program, and holds a nonnegative integer. (This is where the name PREG comes from: PRogram REGister.)

PREG has n commands:

Command Description
,(X) Input into register X
.(X) Output register X
+(X) Increment register X
-(X) Decrement register X
?(X) Run program X if register X is non-zero
(X);(Y) Copy the value of register X into register Z, where Z is the concatenation of X and Y
(X):(Y):(Z) Copy the value of register X into register W, where W is obtained by replacing the first occurrence of Y in X by Z
[X] Run X while register X is nonzero