DecimalToBinary

DecToBin$ function

Simple function with (very) simple demo program illustrating how to build a string containing the binary representation of a decimal number.

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• Not too much explanation really necessary on this one. The function takes an integer argument and uses a DO...LOOP structure to repeatedly perform a logical AND operation on that argument and each sequential exponentiation of 2 until that exponentiation is greater than the original number. If the function is fed anything other than a nonzero integer value, it returns "0". A small amount of additional coding could also add digit grouping capability.

 [loop] 
 input a$ 
 if a$ = "" then end 
 print DecToBin$(val(a$)) 
 goto [loop] 
 
 
 function DecToBin$(decNum) 
 if (decNum) then 
 decNum = abs(decNum) 
 if (decNum = int(decNum))) then 
 do 
 if (decNum and 2^x) then 
 DecToBin$ = "1" + DecToBin$ 
 else 
 DecToBin$ = "0" + DecToBin$ 
 end if 
 
 x = x + 1 
 loop until (2^x > decNum) 
 else 
 DecToBin$ = "0" 
 end if 
 else 
 DecToBin$ = "0" 
 end if 
 end function