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N^N — compute exponential
&e — base of natural logarithms
&phi — golden ratio
&pi — pi
&random : i — random seed
+N — compute positive
-N — compute negative
abs — compute absolute value
acos — compute arc cosine
asin — compute arc sine
atan — compute arc tangent
cos — compute cosine
dtor — convert degrees to radians
exp — compute exponential
i to i by i — generate integers in sequence
iand — compute bitwise AND
icom — compute bitwise complement
integer — convert to integer
ior — compute bitwise inclusive OR
ishift — arithmetic shift bits
ixor — compute bitwise exclusive OR
log — compute logarithm
N%N — compute remainder
N+N — compute sum
N/N — compute quotient
N1∗N2 — compute product
N<=N — numerically less than or equal
N<N — numerically less than
N=N — numerically equal
N>=N — numerically greater than or equal
N>N — numerically greater than
numeric — convert to numeric
N~=N — numerically not equal
N–N — compute difference
real — convert to real
rtod — convert radians to degrees
seq — generate sequence of integers
sin — compute sine
sqrt — compute square root
tan — compute tangent

Index of Function Types:
affects &pos
character sets
co-expressions
control structures
file processing
generators
infix operations
keywords
lists, sets and tables
math
metadata
output formatting
pattern matching
prefix operations
records
strings
windows and keyboards

Index of Subsystems:
base
digitcnt.icn
SNOBOL4 functions
 
process argument list
 
Description

x1 ! X : x2
If x1 is a function or procedure, x1 ! X produces the outcome of calling x1 with the arguments in the list or record X.

If x1 is an integer, x1 ! X produces X[x1] but fails if x1 is out of range of X.
 
Parameters
x1
function or integer
X
list or record
returns
function outcome or X[x1] or fail
 
Errors
106 x not procedure or integer
108 X is not list or record
 
See Also