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Revision as of 21:59, 12 November 2006

!/bin/bash
hex to decimal number converter
mutante (s23.org) 11/2006

if [ ! -n "$1" ] then read -p "Give me a hex number: " hex else hex=$1 fi

length=${#hex} i=0 result=0 let length-- pos=0 while [ $length -ge 0 ]; do digit=${hex:$length:1} case "$digit" in A | a) ddigit=10;; B | b) ddigit=11;; C | c) ddigit=12;; D | d) ddigit=13;; E | e) ddigit=14;; F | f) ddigit=15;; [0-9]) ddigit=$digit;;

) echo "Bad input. Only 0-9 and A-F are allowed."; exit 1;;

esac factor=`echo "(16^$pos)" | bc` subresult=`echo "$factor*$ddigit" | bc` if [ ! -n "$1" ]; then echo "[$pos]: $digit => $ddigit * (16^$pos) = $ddigit * $factor = $subresult +"; fi let result=$result+$subresult let pos++ let length-- done

if [ ! -n "$1" ]; then echo "Result: $hex (hex) is $result (dec)" | boxes; else echo "$hex (hex) = $result (dec)"; fi exit 0 </highlightSyntax>

 ./hex2dec.sh AFFE23
AFFE23 (hex) = 11533859 (dec)

 ./hex2dec.sh
Give me a hex number: F712
[0]: 2 => 2 * (16^0) = 2 * 1 = 2 +
[1]: 1 => 1 * (16^1) = 1 * 16 = 16 +
[2]: 7 => 7 * (16^2) = 7 * 256 = 1792 +
[3]: F => 15 * (16^3) = 15 * 4096 = 61440 +
/*************************************/
/* Result: F712 (hex) is 63250 (dec) */
/*************************************/

@@ Line 4: / Line 4: @@
 # mutante (s23.org) 11/2006
+if [ ! -n "$1" ]
-read -p "Give me a hex number " hex
+then
+read -p "Give me a hex number: " hex
+else
+hex=$1
+fi
 length=${#hex}
 i=0
@@ Line 12: / Line 18: @@
 while [ $length -ge 0 ];
 do
-  digit=${hex:$length:1}
+digit=${hex:$length:1}
+case "$digit" in
+A | a) ddigit=10;;
-  case "$digit" in
-   A | a) ddigit=10;;
+B | b) ddigit=11;;
-   B | b) ddigit=11;;
+C | c) ddigit=12;;
-   C | c) ddigit=12;;
+D | d) ddigit=13;;
-   D | d) ddigit=13;;
+E | e) ddigit=14;;
-   E | e) ddigit=14;;
+F | f) ddigit=15;;
-   F | f) ddigit=15;;
+[0-9]) ddigit=$digit;;
+*) echo "Bad input. Only 0-9 and A-F are allowed."; exit 1;;
-   [0-9]) ddigit=$digit;;
+esac
-       *) echo "Bad input. Only 0-9 and a-f are allowed."; exit 1;;
+factor=`echo "(16^$pos)" | bc`
-  esac
+subresult=`echo "$factor*$ddigit" | bc`
+if [ ! -n "$1" ]; then echo "[$pos]: $digit => $ddigit * (16^$pos) = $ddigit * $factor = $subresult +"; fi
- factor=`echo "(16^$pos)" | bc`
+let result=$result+$subresult
- subresult=`echo "$factor*$ddigit" | bc`
+let pos++
- echo "[$pos]: $digit = $ddigit * (16^$pos) = $ddigit * $factor = $subresult"
+let length--
- let result=$result+$subresult
- let pos++
- let length--
 done
-echo "Result: $hex (hex) is $result (dec)" | boxes
+if [ ! -n "$1" ]; then echo "Result: $hex (hex) is $result (dec)" | boxes; else echo "$hex (hex) = $result (dec)"; fi
 exit 0
 </highlightSyntax>
 <pre>
- ./hex2dec.sh
+ ./hex2dec.sh AFFE23
+AFFE23 (hex) = 11533859 (dec)
+ ./hex2dec.sh
-Give me a hex number 523F
+Give me a hex number: F712
-[0]: F = 15 * (16^0) = 15 * 1 = 15
-[1]: 3 = 3 * (16^1) = 3 * 16 = 48
+[0]: 2 => 2 * (16^0) = 2 * 1 = 2 +
-[2]: 2 = 2 * (16^2) = 2 * 256 = 512
+[1]: 1 => 1 * (16^1) = 1 * 16 = 16 +
-[3]: 5 = 5 * (16^3) = 5 * 4096 = 20480
+[2]: 7 => 7 * (16^2) = 7 * 256 = 1792 +
+[3]: F => 15 * (16^3) = 15 * 4096 = 61440 +
 /*************************************/
-/* Result: 523F (hex) is 21055 (dec) */
+/* Result: F712 (hex) is 63250 (dec) */
 /*************************************/
 </pre>

Revision as of 21:59, 12 November 2006

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