Who determines the ordering of characters

Question

I have a query based on the below program -

char ch;
ch = \'z\';
while(ch >= \'a\')
{
    printf(\"char is  %c and the value is %d\\n\", ch, ch);
    ch =         


        

Answer 1

Why is the printing of whole set of lowercase letters not guaranteed in the above program.

Because it's possible to use C with an EBCDIC character encoding, in which the letters aren't consecutive.