Jos,

A static array lookup is going to do this a lot faster than a character by character conversion:

dimension gaHexToBin[16]

gaHexToBin[1]  = '0000'
gaHexToBin[2]  = '0001'
gaHexToBin[3]  = '0010'
gaHexToBin[4]  = '0011'
gaHexToBin[5]  = '0100'
gaHexToBin[6]  = '0101'
gaHexToBin[7]  = '0110'
gaHexToBin[8]  = '0111'
gaHexToBin[9]  = '1000'
gaHexToBin[10] = '1001'
gaHexToBin[11] = '1010'
gaHexToBin[12] = '1011'
gaHexToBin[13] = '1100'
gaHexToBin[14] = '1101'
gaHexToBin[15] = '1110'
gaHexToBin[16] = '1111'

lnValue = 12345
lcHexValue = substr( transform( lnValue, '@0' ), 3 )
lcBinValue = ''
for i = 1 to 8
   lcBinValue = lcBinValue + gaHexToBin[val( substr( lcHexValue, i, 1 ) ) + 1]
endfor

? lcBinValue

>I have written my own number to binary to number function but I thought I would ask if there was an easier method. I am looking to take number eg 123456 and convert that into a binary string like "00000000000000011110001001000000". Is there a fast way to do this num to char-bin and back to number?