Provided by:
manpages-zh_1.5.2-1_all 
NAME
expr -
SYNOPSIS
expr arg ?arg arg ...?
_________________________________________________________________
DESCRIPTION
(concatenate) arg ()Tcl (evaluate) Tcl C C ()
expr 8.2 + 6
14.2. Tcl C Tcl
OPERANDS
Tcl ()( 0)( 0x) ANSI C ((installation) fFl L ): 2.13.6e47.91e+16()
:
[1]
[2] Tcl $
[3]
[4]
[5] Tcl
[6] sin($x)
()
a 3 b 6
expr 3.1 + $a 6.1
expr 2 + "$a.$b" 5.6
expr 4*[llength "6 2"] 8
expr {{word one} < "word $a"}0
OPERATORS
:
- + ~ ! (Unary)(bit-wise) NOT NOT NOT
* / %
+ -
<< >> (propagate)
< > <= >= Boolean 1 0
== != Boolean /
&
^
|
&& 1 0 boolean ()
|| 0 1 boolean ()
x?y:z If-then-else C x y z x
C (group)
expr 4*2 < 7
0.
&&, ||, ?: C
expr {$v ? [a] : [b]}
[a] [b] $v Tcl expr [a] [b]
MATH FUNCTIONS
Tcl : abs cosh log sqrt
acos double log10 srand
asin exp pow tan
atan floor rand tanh atan2 fmod round
ceil hypot sin cos int sinh
abs(arg)
arg Arg
acos(arg)
arg [0,pi] Arg [-1,1] .TP asin(arg) arg [-pi/2,pi/2] Arg
[-1,1]
atan(arg)
arg [-pi/2,pi/2]
atan2(x, y)
y/x [-pi,pi] x y 0
ceil(arg)
arg
cos(arg)
arg
cosh(arg)
arg
double(arg)
arg arg arg
exp(arg)
arg e**arg
floor(arg)
arg
fmod(x, y)
x y y 0
hypot(x, y)
(x*x+y*y)
int(arg)
arg argarg ()
log(arg)
arg Arg
log10(arg)
arg 10 ()Arg
pow(x, y)
x y x y
rand() 1 ()[0,1) srand
round(arg)
arg arg arg
sin(arg)
arg
sinh(arg)
arg
sqrt(arg)
arg Arg
srand(arg)
arg
tan(arg)
arg
tanh(arg)
arg
Tcl_CreateMathFunc ()
TYPES, OVERFLOW, PRECISION
C long C double Tcl C
expr 5 / 4
1
expr 5 / 4.0
expr 5 / ( [string length "abcd"] + 0.0 )
1.25 . e
expr 20.0/5.0
4.0, 4.
STRING OPERATIONS
C sprintf %d %g
expr {"0x03" > "2"}
expr {"0y" < "0x12"}
1 18 Tcl == string
PERFORMANCE CONSIDERATIONS
Tcl
: Tcl expr
set a 3
set b {$a + 2}
expr $b*4
11 4 Tcl b $a + 2 expr $a + 2*4
(emit)
KEYWORDS
arithmetic, boolean, compare, expression, fuzzy comparison
[]
[]
2001/07/22
Linux man :
http://cmpp.linuxforum.net