PL/0

At least two programming languages are known as PL/0. One is a subset of IBM's general-purpose programming language PL/I.

The other PL/0, covered here, is similar to but much simpler than the general-purpose programming language Pascal, intended as an educational programming language. It serves as an example of how to construct a compiler. It was originally introduced in the book, Algorithms + Data Structures = Programs, by Niklaus Wirth in 1975. It features quite limited language constructs: there are no real numbers, very few basic arithmetic operations and no control-flow constructs other than "if" and "while" blocks. While these limitations make writing real applications in this language impractical, it helps the compiler remain compact and simple.