summary, section 2.

2. Languages

o CC: Compile and/or link edit programs in the C language. The UNIX operating system, most of the subsystems and C itself are written in C. For a full description of C, read The C Programming Language, Brian W. Kernighan and Dennis M. Ritchie, Prentice-Hall, 1978.
O: General purpose language designed for structured programming.
O: Data types include character, integer, float, double, pointers to all types, functions returning above types, arrays of all types, structures and unions of all types.
O: Operations intended to give machine-independent control of full machine facility, including to-memory operations and pointer arithmetic.
O: Macro preprocessor for parameterized code and inclusion of standard files.
O: All procedures recursive, with parameters by value.
O: Machine-independent pointer manipulation.
O: Object code uses full addressing capability of the PDP-11.
O: Runtime library gives access to all system facilities.
O: Definable data types.
O: Block structure
o LINT: Verifier for C programs. Reports questionable or nonportable usage such as: Mismatched data declarations and procedure interfaces.

Nonportable type conversions.

Unused variables, unreachable code, no-effect operations.

Mistyped pointers.

Obsolete syntax.
O
Full cross-module checking of separately compiled programs.
o CB
A beautifier for C programs.
Does proper indentation and placement of braces.

o F77: A full compiler for ANSI Standard Fortran 77.
O: Compatible with C and supporting tools at object level.
O: Optional source compatibility with Fortran 66.
O: Free format source.
O: Optional subscript-range checking, detection of uninitialized variables.
O: All widths of arithmetic: 2- and 4-byte integer; 4- and 8-byte real; 8- and 16-byte complex.
o RATFOR: Ratfor adds rational control structure a` la C to Fortran.
O: Compound statements.
O: If-else, do, for, while, repeat-until, break, next statements.
O: Symbolic constants.
O: File insertion.
O: Free format source
O: Translation of relationals like >, >=.
O: Produces genuine Fortran to carry away.
O: May be used with F77.
o STRUCT: Converts ordinary ugly Fortran into structured Fortran (i.e., Ratfor), using statement grouping, if-else, while, for, repeat-until.

o BAS: An interactive interpreter, similar in style to BASIC. Interpret unnumbered statements immediately, numbered statements upon `run'.
O: Statements include: comment,
dump,
for...next,
goto,
if...else...fi,
list,
print,
prompt,
return,
run,
save.
O: All calculations double precision.
O: Recursive function defining and calling.
O: Builtin functions include log, exp, sin, cos, atn, int, sqr, abs, rnd.
O: Escape to ED for complex program editing.
o DC: Interactive programmable desk calculator. Has named storage locations as well as conventional stack for holding integers or programs.
O: Unlimited precision decimal arithmetic.
O: Appropriate treatment of decimal fractions.
O: Arbitrary input and output radices, in particular binary, octal, decimal and hexadecimal.
O: Reverse Polish operators: + - * /
remainder, power, square root,
load, store, duplicate, clear,
print, enter program text, execute.
o BC: A C-like interactive interface to the desk calculator DC.
O: All the capabilities of DC with a high-level syntax.
O: Arrays and recursive functions.
O: Immediate evaluation of expressions and evaluation of functions upon call.
O: Arbitrary precision elementary functions: exp, sin, cos, atan.
O: Go-to-less programming.

o YACC: An LR(1)-based compiler writing system. During execution of resulting parsers, arbitrary C functions may be called to do code generation or semantic actions.
O: BNF syntax specifications.
O: Precedence relations.
O: Accepts formally ambiguous grammars with non-BNF resolution rules.
o LEX: Generator of lexical analyzers. Arbitrary C functions may be called upon isolation of each lexical token.
O: Full regular expression, plus left and right context dependence.
O: Resulting lexical analysers interface cleanly with YACC parsers.