31 lines
635 B
Bash
31 lines
635 B
Bash
|
#!/bin/bash
|
||
|
|
#
|
||
|
|
# any2dec.sh <radix> <string_representation_in_that_radix>
|
||
|
|
#
|
||
|
|
if [[ $# -lt 2 ]]
|
||
|
|
then
|
||
|
|
echo "Usage: $0 <radix> <string_representation_in_that_radix>"
|
||
|
|
exit
|
||
|
|
fi
|
||
|
|
if [[ $1 -lt 2 || $1 -gt 36 ]]
|
||
|
|
then
|
||
|
|
echo "The radix is a decimal between 2 and 36"
|
||
|
|
exit
|
||
|
|
fi
|
||
|
|
DIGITS=0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||
|
|
LEGAL_DIGITS=$(expr substr $DIGITS 1 $1)
|
||
|
|
decimal=0
|
||
|
|
l=$(expr length $2)
|
||
|
|
for ((i=1;i<=l;i++))
|
||
|
|
do
|
||
|
|
digit=$(expr substr $2 $i 1)
|
||
|
|
pos=$(expr index $LEGAL_DIGITS $digit)
|
||
|
|
if [[ pos -eq 0 ]]
|
||
|
|
then
|
||
|
|
echo "Authorized digits are : $LEGAL_DIGITS"; exit
|
||
|
|
fi
|
||
|
|
digit_val=$((pos-1))
|
||
|
|
decimal=$((decimal*$1+digit_val))
|
||
|
|
done
|
||
|
|
echo "decimal : $decimal"
|
||
|
|
exit
|