Thread: Reading in a number backwards!

Hi,

I have to write a program that will take a binary number (10010111) and then tell it decimal equivalency. But i do not know how to read in a number backwards. I know how to read them in one at a time from left to right but not right to left like i need to.


Any tips or suggestions would be greatly appreciated.

One solution is to NOT each bit, thus you will end up with the reverse integer.

The NOT syntex for C++ is this: ~

Kuphryn

To get the last number in an int, just do a modulus 10. For example N%10 will give you the last digit for the number N. If you want to keep going, divide N by 10 to chop off the last number, then do modulus again.

you could put the number in a char array, use a for loop or two to put the number backwards in another array, and then use atoi() to make it an integer again..

Or you could read them into a stack (instead of a string/char*), just push each one in as you get to it. Then pop them out again.
Something like this, where Str is an AnsiString that contains the string just inputed, and S is a stack:

Code:

  for (int i = 0; i < Str.Length(); i++)
    S.Push(Str[i]);

  AnsiString Str2;
  for (int i = 0; i < Str.Length(); i++)
    Str2 = S.Pop(Str[i])