问转换为基地10

EN

import string

def baseNTodecimal():
    # get the number as a string
    number = raw_input("Please type a number: ")
    # convert it to all uppercase to match hexDigits (below)
    number = string.upper(number)
    # get the base as an integer
    base = input("Please give me the base: ")
    # the number of values that we have to change to base10
    digits = len(number)
    base10 = 0
    # first position of any baseN number is 1's
    position = 1
    # set up a string so that the position of
    # each character matches the decimal
    # value of that character
    hexDigits = "0123456789ABCDEF"
    # for each 'digit' in the string
    for i in range(1, digits+1):
        # find where it occurs in the string hexDigits
        digit = string.find(hexDigits, number[-i])
        # multiply the value by the base position
        # and add it to the base10 total
        base10 = base10 + (position * digit)
        print number[-i], "is in the " + str(position) + "'s position"
        # increase the position by the base (e.g., 8's position * 2 = 16's position)
        position = position * base
    print "And in base10 it is", base10

function to_base10($input, $base)
{
  $result = 0;
  $length = strlen($input);
  for ($x=$length-1; $x>=0; $x--)
    $result += (int)$input[$x] * pow($base, ($length-1)-$x);
  return $result;
}