[courses] [C] lesson 10 exercise 1 ans (sorry for the # of posts)

[Lorne Gutz]

>
>    for(i = 0; i < BITS; i++) {
>       if( ((input & (1 << i)) >> i)) count++;
> /* that was the part I don't understand */

The if statment seems to have a lot of extra baggage.
It should be simplified to read:
         if( ( input & ( 1 << i )) )
             count++;
Not sure what the >> i was added for but it is NOT
required.  

 Let me quote the C standard:
      In all cases, if the control expression is 0, it is taken to be "false"; 
if it is non-zero, it is taken to be 'true'.  More precisely, the type of a 
control expression e must be such that the expression
        ( e ) != 0
may be legally evaluated.  If the result of this last expression is 1, e
is said to be non-zero; otherwise, e is said to be zero.  In practice,
this means that e may have integral, pointer, or floating-point type.
Values of enumeration types may also be permitted depending on the 
semantics chosen for enumerations.

KISS   :)

cheers
Lorne