Answer Posted / rudra prasad panda

Pointer is a variable containing the addres of another
variable;
Constant pointer is a variable which points to a variable
constantly.it means that , once it is initialised,it cannot
be changed.Till the end of program,it points to that
variable only;
EXAMPLE:
char k,m;
const char *p=&k;
p=&m;//(syntax error)

********
A pointer to a constant is a pointer such that the contents
of the variable(pointed by the pointer)cannot be modified
throuhg the pointer;
EXAMPLE:
char m='l';
char * const p;
p=&m;
*p='u';//syntax error
m='k';//no syntax error

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