A good answer might be:

          binary    
 hex      groups of four 

0x1A4  =  0001 1010 0100 =


  binary          octal
  ungrouped       groups of three

000110100100  =  000 110 100 100   =  0644eight

Remember to group bits starting from the right. If the left group is one or two bits short, add zero bits on the left as needed.

Decimal to base B

Algorithm: Convert a number
from base 10 to base B repn		 
place  = 0;
number = number to be converted
         
while (number > 0 )
{
  digit[place] = number mod B ; 
  number       = number div B ;
  place        = place + 1 ;
}

You know how to convert from Base B to Decimal. Now for converting from Decimal to base B. The algorithm converts number from base 10 representation to base B respresentation.

div means integer division and mod means modulo. number div B is the number of times B goes into number. number mod B is the left-over amount. For example 15 div 6 = 2 and 15 mod 6 = 3.

Here is an example: convert 5410 to hex representation. The base is 16. The first execution of the loop body calculates digit[0] the right-most digit of the hex number.


QUESTION 16:

What is digit[ 0 ] = 54 mod 16 ?

What is number = 54 div 16 ?