const char*

char const* p2="Mary";

 

p2 is a pointer to a constant "Mary"
p2 can change to point to another constant string, but you can't change the value "May" thru p2.

p1 is a constant pointer to "John"
p1 can't change, but you can change "John" thru p1.

 

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char const* p2 = "Mary";*p2 = 'C'; // not allowed.p2 = "Margareth";  // allowedchar * const p1 = "John";*p1 = 'C'; // allowedp1 = "Margarth"; // not allowed