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PROGRAM:
NAME
hoc - interactive floating point language
SYNOPSIS
hoc [ file ... ] [ -e expression ]
DESCRIPTION
Hoc interprets a simple language for floating point arithmetic, at about the level of
BASIC, with C-like syntax and functions.
The named files are read and interpreted in order. If no file is given or if file is hoc
interprets the standard input. The -e option allows input to hoc to be specified on the
command line, to be treated as if it appeared in a file.
Hoc input consists of expressions and statements. Expressions are evaluated and their
results printed. Statements, typically assignments and function or procedure definitions,
produce no output unless they explicitly call print.
Variable names have the usual syntax, including the name by itself contains the value of
the last expression evaluated. The variables E, PI, PHI, GAMMA and DEG are predefined;
the last is 59.25..., degrees per radian.
Expressions are formed with these C-like operators, listed by decreasing precedence.
^ exponentiation
! - ++ --
* / %
+ -
> >= < <= == !=
&&
||
= += -= *= /= %=
Built in functions are abs, acos, asin, atan (one argument), cos, cosh, exp, int, log,
log10, sin, sinh, sqrt, tan, and tanh. The function read(x) reads a value into the
variable x and returns 0 at EOF; the statement print prints a list of expressions that may
include string constants such as "hello\n".
Control flow statements are if-else, while, and for, with braces for grouping. Newline
ends a statement. Backslash-newline is equivalent to a space.
Functions and procedures are introduced by the words func and proc; return is used to
return with a value from a function.
EXAMPLES
func gcd(a, b) {
temp = abs(a) % abs(b)
if(temp == 0) return abs(b)
return gcd(b, temp)
}
for(i=1; i<12; i++) print gcd(i,12)
SOURCE
/src/cmd/hoc
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