Const qualifier, const limitation

Const qualifier, const limitation

 

 

1 int main () 2 {3 const int a; 4 int const B; 5 const char * c; // modify the memory variable c pointing to a pointer with a constant integer of 0 (the memory data pointed to cannot be changed, but the data itself can be changed) 6 char * const d; char buf [100]; // The constant pointer variable of d cannot be modified, but the memory data pointed to can be changed to 7 const char * const e; // The e pointer variable cannot be modified, and the memory data to be pointed to cannot be modified 8 9 // conclusion: the variable modified by const in C language is false 10 // const int num = 100; 11 // int * p = & num; 12 // * p = 50; 13 // printf ("% d \ n", num); 14 15 return 0; 16}