#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 ))

echo unary plus, minus
echo -4 $(( +4 - 8 ))
echo 4 $(( -4 + 8 ))

echo conditional expressions
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))

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
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

echo check precedence of assignment vs. conditional operator
# 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))  )

echo check precedence of assignment vs. conditional operator
#ash# declare -i x=2
      x=2
# ash says "line NNN: syntax error: 0 ? x+=2 : 20"
#ash# echo 20 $((0 ? x+=2 : 20))

echo associativity of assignment-operator operator
#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

echo octal, hex
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 ))

echo other bases
echo 10 $(( 16#a ))
echo 10 $(( 32#a ))
echo 10 $(( 56#a ))
echo 10 $(( 64#a ))

echo 10 $(( 16#A ))
echo 10 $(( 32#A ))
echo 36 $(( 56#A ))
echo 36 $(( 64#A ))

echo 62 $(( 64#@ ))
echo 63 $(( 64#_ ))

#ash# # weird bases (error)
#ash# echo $(( 3425#56 ))

echo missing number after base
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

# ++ is not a inc operator on non-variable, it is the + + sequence
echo 7 $(( ++7 ))
(  echo $(( 7-- ))    )

(  echo $(( --x=7 ))  )
(  echo $(( ++x=7 ))  )

(  echo $(( x++=7 ))  )
(  echo $(( x--=7 ))  )

echo 4 $x

echo 7 $(( +7 ))
echo -7 $(( -7 ))

# ++ is not a inc operator on non-variable, it is the + + sequence
echo $(( ++7 ))
echo $(( --7 ))

${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