PL/I - Programming language

PL/I, aka Programming Language One, is a programming language created in 1964.

#269on PLDB

60Years Old

PL/I (Programming Language One, pronounced ) is a procedural, imperative computer programming language designed for scientific, engineering, business and system programming uses. It has been used by various academic, commercial and industrial organizations since it was introduced in the 1960s, and continues to be actively used. PL/I's main domains are data processing, numerical computation, scientific computing, and system programming; it supports recursion, structured programming, linked data structure handling, fixed-point, floating-point, complex, character string handling, and bit string handling. Read more on Wikipedia...

Tags: programming language
Early development of PL/I happened in IBM
There are 1 Project Euler users using PL/I
PL/I on HOPL
PL/I appears in the TIOBE Index
See also: (25 related languages) PL/M, XPL, PL/P, PL/C, COBOL, Fortran, Algol, CMS-2, SP/k, B, Rexx, AUTOCODER, COMTRAN, GEORGE, Multics, BASIC, Pascal, Daisy Systems, Linux, HAL/S, Unix, Java, C, ISBN, DOI
2 PLDB concepts link to PL/I: cloc, PL/I-FORMAC

Example from Wikipedia:

/* Read in a line, which contains a string,
/* and then print every subsequent line that contains that string. */

find_strings: procedure options (main);
   declare pattern character (100) varying;
   declare line character (100) varying;
   declare line_no fixed binary;

   on endfile (sysin) stop;

   get edit (pattern) (L);
   line_no = 1;
   do forever;
      get edit (line) (L);
      if index(line, pattern) > 0 then
         put skip list (line_no, line);
      line_no = line_no + 1;
   end;

end find_strings;

Language features

Feature	Supported	Example	Token
Fixed Point Numbers	✓
Assignment	✓		=
Comments	✓	/* A comment */
MultiLine Comments	✓	/* A comment */	/* */
Threads	✓
Pointers	✓
Semantic Indentation	X