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