2009-04-03 01:47:49 +05:30
|
|
|
#ash# set +o posix
|
|
|
|
#ash# declare -i iv jv
|
|
|
|
|
|
|
|
echo "Format: 'expected actual'"
|
|
|
|
|
|
|
|
iv=$(( 3 + 5 * 32 ))
|
|
|
|
echo 163 $iv
|
|
|
|
#ash# iv=iv+3
|
|
|
|
#ash# echo 166 $iv
|
|
|
|
iv=2
|
|
|
|
jv=iv
|
|
|
|
|
|
|
|
: $((jv *= 2)) ##hush## let "jv *= 2"
|
|
|
|
echo 4 $jv
|
|
|
|
jv=$(( $jv << 2 ))
|
|
|
|
echo 16 $jv
|
|
|
|
|
|
|
|
: $((jv=$jv / 2)) ##hush## let jv="$jv / 2"
|
|
|
|
echo 8 $jv
|
|
|
|
#ash# jv="jv >> 2"
|
|
|
|
: $((jv=jv >> 2)) ##hush## let jv="jv >> 2"
|
|
|
|
echo 2 $jv
|
|
|
|
|
|
|
|
iv=$((iv+ $jv))
|
|
|
|
echo 4 $iv
|
|
|
|
echo 2 $((iv -= jv))
|
|
|
|
echo 2 $iv
|
|
|
|
echo 1 $(( iv == jv ))
|
|
|
|
echo 0 $(( iv != $jv ))
|
|
|
|
echo 0 $(( iv < jv ))
|
|
|
|
echo 0 $(( $iv > $jv ))
|
|
|
|
echo 1 $(( iv <= $jv ))
|
|
|
|
echo 1 $(( $iv >= jv ))
|
|
|
|
|
|
|
|
echo 2 $jv
|
|
|
|
echo -3 $(( ~$jv ))
|
|
|
|
echo -2 $(( ~1 ))
|
|
|
|
echo 1 $(( ! 0 ))
|
|
|
|
|
|
|
|
echo 0 $(( jv % 2 ))
|
|
|
|
echo 2 $(( $iv % 4 ))
|
|
|
|
|
|
|
|
echo 131072 $(( iv <<= 16 ))
|
|
|
|
echo 29 $(( iv %= 33 ))
|
|
|
|
|
|
|
|
echo 33 $(( 33 & 55 ))
|
|
|
|
echo 49 $(( 33 | 17 ))
|
|
|
|
|
|
|
|
echo 1 $(( iv && $jv ))
|
|
|
|
echo 1 $(( $iv || jv ))
|
|
|
|
|
|
|
|
echo 0 $(( iv && 0 ))
|
|
|
|
echo 0 $(( iv & 0 ))
|
|
|
|
echo 1 $(( iv && 1 ))
|
|
|
|
echo 1 $(( iv & 1 ))
|
|
|
|
|
|
|
|
echo 1 $(( $jv || 0 ))
|
|
|
|
echo 2 $(( jv | 0 ))
|
|
|
|
echo 3 $(( jv | 1 ))
|
|
|
|
echo 1 $(( $jv || 1 ))
|
|
|
|
|
|
|
|
: $((iv *= jv)) ##hush## let 'iv *= jv'
|
|
|
|
echo 58 $iv
|
|
|
|
echo 2 $jv
|
|
|
|
: $((jv += $iv)) ##hush## let "jv += $iv"
|
|
|
|
echo 60 $jv
|
|
|
|
|
|
|
|
echo 1 $(( jv /= iv ))
|
|
|
|
echo 256 $(( jv <<= 8 ))
|
|
|
|
echo 16 $(( jv >>= 4 ))
|
|
|
|
|
|
|
|
echo 62 $(( iv |= 4 ))
|
|
|
|
echo 4 $(( iv &= 4 ))
|
|
|
|
|
|
|
|
echo 29 $(( iv += (jv + 9)))
|
|
|
|
echo 5 $(( (iv + 4) % 7 ))
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo unary plus, minus
|
2009-04-03 01:47:49 +05:30
|
|
|
echo -4 $(( +4 - 8 ))
|
|
|
|
echo 4 $(( -4 + 8 ))
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo conditional expressions
|
2009-04-03 01:47:49 +05:30
|
|
|
echo 1 $(( 4<5 ? 1 : 32))
|
|
|
|
echo 32 $(( 4>5 ? 1 : 32))
|
|
|
|
echo 32 $(( 4>(2+3) ? 1 : 32))
|
|
|
|
echo 1 $(( 4<(2+3) ? 1 : 32))
|
|
|
|
echo 1 $(( (2+2)<(2+3) ? 1 : 32))
|
|
|
|
echo 32 $(( (2+2)>(2+3) ? 1 : 32))
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo 'check that parentheses in `cmd` are interpreted correctly'
|
|
|
|
# \x28 is '('
|
|
|
|
echo 3 $(( ( `printf '(\x28 1'` + `echo 2\)\)` ) ))
|
|
|
|
|
|
|
|
echo check that the unevaluated part of the ternary operator does not do evaluation or assignment
|
2009-04-03 01:47:49 +05:30
|
|
|
x=i+=2
|
|
|
|
y=j+=2
|
|
|
|
#ash# declare -i i=1 j=1
|
|
|
|
i=1
|
|
|
|
j=1
|
|
|
|
echo 20 $((1 ? 20 : (x+=2)))
|
|
|
|
#ash# echo $i,$x # ash mishandles this
|
|
|
|
echo 30 $((0 ? (y+=2) : 30))
|
|
|
|
#ash# echo $j,$y # ash mishandles this
|
|
|
|
|
|
|
|
x=i+=2
|
|
|
|
y=j+=2
|
|
|
|
#ash# declare -i i=1 j=1
|
|
|
|
i=1
|
|
|
|
j=1
|
|
|
|
echo 20 $((1 ? 20 : (x+=2)))
|
|
|
|
#ash# echo $i,$x # ash mishandles this
|
|
|
|
echo 30 $((0 ? (y+=2) : 30))
|
|
|
|
#ash# echo $i,$y # ash mishandles this
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo check precedence of assignment vs. conditional operator
|
2009-04-03 01:47:49 +05:30
|
|
|
# should be an error
|
|
|
|
#ash# declare -i x=2
|
|
|
|
x=2
|
|
|
|
#ashnote# bash reports error but continues, ash aborts - using subshell to 'emulate' bash:
|
|
|
|
( y=$((1 ? 20 : x+=2)) )
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo check precedence of assignment vs. conditional operator
|
2009-04-03 01:47:49 +05:30
|
|
|
#ash# declare -i x=2
|
|
|
|
x=2
|
|
|
|
# ash says "line NNN: syntax error: 0 ? x+=2 : 20"
|
|
|
|
#ash# echo 20 $((0 ? x+=2 : 20))
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo associativity of assignment-operator operator
|
2009-04-03 01:47:49 +05:30
|
|
|
#ash# declare -i i=1 j=2 k=3
|
|
|
|
i=1
|
|
|
|
j=2
|
|
|
|
k=3
|
|
|
|
echo 6 $((i += j += k))
|
|
|
|
echo 6,5,3 $i,$j,$k
|
|
|
|
|
2010-05-22 03:56:06 +05:30
|
|
|
echo octal, hex
|
2009-04-03 01:47:49 +05:30
|
|
|
echo 263 $(( 0x100 | 007 ))
|
|
|
|
echo 255 $(( 0xff ))
|
|
|
|
#ash# echo 255 $(( 16#ff ))
|
|
|
|
#ash# echo 127 $(( 16#FF/2 ))
|
|
|
|
#ash# echo 36 $(( 8#44 ))
|
|
|
|
|
|
|
|
echo 40 $(( 8 ^ 32 ))
|
|
|
|
|
|
|
|
#ash# # other bases
|
|
|
|
#ash# echo 10 $(( 16#a ))
|
|
|
|
#ash# echo 10 $(( 32#a ))
|
|
|
|
#ash# echo 10 $(( 56#a ))
|
|
|
|
#ash# echo 10 $(( 64#a ))
|
|
|
|
#ash#
|
|
|
|
#ash# echo 10 $(( 16#A ))
|
|
|
|
#ash# echo 10 $(( 32#A ))
|
|
|
|
#ash# echo 36 $(( 56#A ))
|
|
|
|
#ash# echo 36 $(( 64#A ))
|
|
|
|
#ash#
|
|
|
|
#ash# echo 62 $(( 64#@ ))
|
|
|
|
#ash# echo 63 $(( 64#_ ))
|
|
|
|
|
|
|
|
#ash# # weird bases (error)
|
|
|
|
#ash# echo $(( 3425#56 ))
|
|
|
|
|
|
|
|
#ash# # missing number after base
|
|
|
|
#ash# echo 0 $(( 2# ))
|
|
|
|
|
|
|
|
# these should generate errors
|
|
|
|
( echo $(( 7 = 43 )) )
|
|
|
|
#ash# echo $(( 2#44 ))
|
|
|
|
( echo $(( 44 / 0 )) )
|
|
|
|
( let 'jv += $iv' )
|
|
|
|
( echo $(( jv += \$iv )) )
|
|
|
|
( let 'rv = 7 + (43 * 6' )
|
|
|
|
|
|
|
|
#ash# # more errors
|
|
|
|
#ash# declare -i i
|
|
|
|
#ash# i=0#4
|
|
|
|
#ash# i=2#110#11
|
|
|
|
|
|
|
|
((echo abc; echo def;); echo ghi)
|
|
|
|
|
|
|
|
#ash# if (((4+4) + (4 + 7))); then
|
|
|
|
#ash# echo ok
|
|
|
|
#ash# fi
|
|
|
|
|
|
|
|
#ash# (()) # make sure the null expression works OK
|
|
|
|
|
|
|
|
#ash# a=(0 2 4 6)
|
|
|
|
#ash# echo 6 $(( a[1] + a[2] ))
|
|
|
|
#ash# echo 1 $(( (a[1] + a[2]) == a[3] ))
|
|
|
|
#ash# (( (a[1] + a[2]) == a[3] )) ; echo 0 $?
|
|
|
|
|
|
|
|
# test pushing and popping the expression stack
|
|
|
|
unset A
|
|
|
|
A="4 + "
|
|
|
|
( echo A $(( ( 4 + A ) + 4 )) )
|
|
|
|
A="3 + 5"
|
|
|
|
echo 16 $(( ( 4 + A ) + 4 ))
|
|
|
|
|
|
|
|
# badly-formed conditional expressions
|
|
|
|
( echo $(( 4 ? : $A )) )
|
|
|
|
( echo $(( 1 ? 20 )) )
|
|
|
|
( echo $(( 4 ? 20 : )) )
|
|
|
|
|
|
|
|
# precedence and short-circuit evaluation
|
|
|
|
B=9
|
|
|
|
echo 9 $B
|
|
|
|
|
|
|
|
# error
|
|
|
|
( echo $(( 0 && B=42 )); echo 9 $B )
|
|
|
|
|
|
|
|
# error
|
|
|
|
( echo $(( 1 || B=88 )); echo 9 $B )
|
|
|
|
|
|
|
|
# ash mistakenly evaluates B=... below
|
|
|
|
#ash# echo 0 $(( 0 && (B=42) ))
|
|
|
|
echo 9 $B
|
|
|
|
#ash# echo 0 $(( (${$} - $$) && (B=42) ))
|
|
|
|
echo 9 $B
|
|
|
|
#ash# echo 1 $(( 1 || (B=88) ))
|
|
|
|
echo 9 $B
|
|
|
|
|
|
|
|
|
|
|
|
# until command with (( )) command
|
|
|
|
x=7
|
|
|
|
|
|
|
|
echo 7 $x
|
|
|
|
#ash# until (( x == 4 ))
|
|
|
|
until test "$x" = 4
|
|
|
|
do
|
|
|
|
echo $x
|
|
|
|
x=4
|
|
|
|
done
|
|
|
|
|
|
|
|
echo 4 $x
|
|
|
|
|
|
|
|
# exponentiation
|
|
|
|
echo 32767 $(( 2**15 - 1))
|
|
|
|
echo 32768 $(( 2**(16-1)))
|
|
|
|
echo 131072 $(( 2**16*2 ))
|
|
|
|
echo 2147483647 $(( 2**31-1))
|
|
|
|
echo 1 $(( 2**0 ))
|
|
|
|
|
|
|
|
# {pre,post}-{inc,dec}rement and associated errors
|
|
|
|
|
|
|
|
x=4
|
|
|
|
|
|
|
|
echo 4 $x
|
|
|
|
echo 4 $(( x++ ))
|
|
|
|
echo 5 $x
|
|
|
|
echo 5 $(( x-- ))
|
|
|
|
echo 4 $x
|
|
|
|
|
|
|
|
echo 3 $(( --x ))
|
|
|
|
echo 3 $x
|
|
|
|
|
|
|
|
echo 4 $(( ++x ))
|
|
|
|
echo 4 $x
|
|
|
|
|
2021-09-26 01:34:45 +05:30
|
|
|
# ++ is not a inc operator on non-variable, it is the + + sequence
|
|
|
|
echo 7 $(( ++7 ))
|
2009-04-03 01:47:49 +05:30
|
|
|
( echo $(( 7-- )) )
|
|
|
|
|
|
|
|
( echo $(( --x=7 )) )
|
|
|
|
( echo $(( ++x=7 )) )
|
|
|
|
|
|
|
|
( echo $(( x++=7 )) )
|
|
|
|
( echo $(( x--=7 )) )
|
|
|
|
|
|
|
|
echo 4 $x
|
|
|
|
|
|
|
|
echo 7 $(( +7 ))
|
|
|
|
echo -7 $(( -7 ))
|
|
|
|
|
2021-09-26 01:34:45 +05:30
|
|
|
# ++ is not a inc operator on non-variable, it is the + + sequence
|
|
|
|
echo $(( ++7 ))
|
|
|
|
echo $(( --7 ))
|
2009-04-03 01:47:49 +05:30
|
|
|
|
|
|
|
${THIS_SH} ./arith1.sub
|
|
|
|
${THIS_SH} ./arith2.sub
|
|
|
|
|
|
|
|
x=4
|
|
|
|
y=7
|
|
|
|
|
|
|
|
#ash# (( x=8 , y=12 ))
|
|
|
|
x=8
|
|
|
|
y=12
|
|
|
|
echo $x $y
|
|
|
|
|
|
|
|
#ash# # should be an error
|
|
|
|
#ash# (( x=9 y=41 ))
|
|
|
|
|
|
|
|
# These are errors
|
|
|
|
unset b
|
|
|
|
( echo $((a b)) )
|
|
|
|
#ash# ((a b))
|
|
|
|
|
|
|
|
n=42
|
|
|
|
printf "%d\n" $n
|
|
|
|
printf "%i\n" $n
|
|
|
|
#ash# echo $(( 8#$(printf "%o\n" $n) ))
|
|
|
|
printf "%u\n" $n
|
|
|
|
#ash# echo $(( 16#$(printf "%x\n" $n) ))
|
|
|
|
#ash# echo $(( 16#$(printf "%X\n" $n) ))
|
|
|
|
|
|
|
|
# causes longjmp botches through bash-2.05b
|
|
|
|
a[b[c]d]=e
|