What is the differnce between " const char * " and " char * const "?

In C Programming, What is the most efficient way to count the number of bits which are set in a value?

What is the differnce between " const char * " and " char * const "?
There is no difference between


const char *


and


char const *





They are both pointers to constant chars. It is merely a style preference on which one to use,


The third variation would be


char * const


This is different than the first 2, This is a constant pointer.


With the first 2, you can make the pointer point to any char variable, but you can't change that variable's value.


eg


char x,y;


const char * p = %26amp;x;


p = y; //legal


*p = 'a'; //illegal





A constant pointer is the opposite. You can only set the pointer location at declaration time, but you can dereference and change the value. eg


char x,y;


char * const p = %26amp;x;


*p = 'a'; //legal


p = %26amp;y ;// illegal








As for counting the number of bits set. I'm with Scottso. I usually just use bit shifts.
Reply:1: i dont beleive there is a difference (not sure)





2: i use bitshift and mod by 2, idk if it is most efficient tho