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Ethiopian multiplication: Difference between revisions
→{{header|UNIX Shell}}: Retrieved formerly-Bash example.
(→{{header|Bash}}: Removed as there is a bash version under Unix/Shell) |
(→{{header|UNIX Shell}}: Retrieved formerly-Bash example.) |
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echo $(ethiopicmult 17 34)</lang>
While breaking if the --posix flag is passed to bash, the following is a slight alternative to the above that forces variable scoping and avoids the use of the *, /, and % operators.
{{works with|bash}}
<lang bash>halve() {
echo -n $(( $1 >> 1 ))
}
double() {
echo -n $(( $1 << 1 ))
}
is_even() {
[ $(( $1 & 1 )) -eq 0 ]
}
multiply() {
local plier=$1
local plicand=$2
local result=0
while [ $plier -gt 0 ]
do
! is_even $plier && (( result += plicand ))
plier=$( halve $plier )
plicand=$( double $plicand )
done
echo -n $result
}
echo $( multiply 17 34 )</lang>
=={{header|Ursala}}==
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