Const in c

int *ptr; // *ptr is an int value
int const *ptrToConst; // *ptrToConst is a constant (int: integer value)
int * const constPtr; // constPtr is a constant (int *: integer pointer)
int const * const constPtrToConst; // constPtrToConst is a constant (pointer)
                                   // as is *constPtrToConst (value)

Source: en.wikipedia.org

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