Using Spiral-Anderson rule, 
1:- const char * a -> a is a pointer to char const (character which is 
constant , the value pointed by the pointer is constant)
2:- char * const a -> a is a const pointer to char (pointer is constant, it 
always point to same memory location)
3:- char const * a -> a is a pointer to const char (again character is 
constant , the value pointed by the pointer is constant)

*a='F' 
a ="Hi" 

>From above 
                     1                      2                          3
*a= 'F'       Legal                  Illegal                  Legal
a="Hi"       Illegal                 Legal                   Illegal

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