Question

I have a function that I dont quite understand

There are 109 addresses from 0 to 110.

How is this code shifting text to the left ?

b=0;
while(b<109)
{
  Display_Buffer[b] = Display_Buffer[b+1];
  b++;
}

if b starts at 0, then b+1 should scroll the text to the RIGHT instead ??? Or am I getting this wrong ? because at 0, b+1 means the address is 1, if its b-1, then the address should be 110 (hence scrolling left) … But thats not the case here, can someone provide a rough explanation ?

The display_buffer contains the string information stored in its arrays.

—

EDIT

Thanks guys !! What if I replaced Display_Buffer[b+1] with [b-1] … will this reverse the process ? how ?

Okay I realized I have to add b=109 and while (b!=0) .. or else that wont make sense.

But still, if Display_Buffer[109]=Display_Buffer[108], does that mean it will produce the same effect as you guys answered but in reverse ?

Answer 1

                           /*  [a|b|c|d|e|f|...]   */
Display[0] = Display[1]    /*  [b|b|c|d|e|f|...]   */
Display[1] = Display[2]    /*  [b|c|c|d|e|f|...]   */
Display[2] = Display[3]    /*  [b|c|d|d|e|f|...]   */
//     ...
                           /*  [b|c|d|e|f|g|...]   */

When you do this kind of things, you must take care to not overwrite from the wrong direction …

                           /*  [a|b|c|d|e|f|...]   */
Display[1] = Display[0]    /*  [a|a|c|d|e|f|...]   */
Display[2] = Display[1]    /*  [a|a|a|d|e|f|...]   */
//     ...
                           /*  [a|a|a|a|a|a|...]   */

To do the same thing from the end

Display[last] = Display[last-1]    /*  [a|b|c|d|e|f|...]   */
//     ...
Display[2] = Display[1]            /*  [a|b|b|c|d|e|...]   */
Display[1] = Display[0]            /*  [a|a|b|c|d|e|...]   */
Display[0] = ' '                   /*  [ |a|b|c|d|e|...]   */