In C++, delete operator should only be used either for the pointers pointing to the memory allocated using new operator or for a NULL pointer, and free() should only be used either for the pointers pointing to the memory allocated using malloc() or for a NULL pointer.
1 #include<stdio.h> 2 #include<stdlib.h> 3 int main() 4 { 5 int x; 6 int *ptr1 = &x; 7 int *ptr2 = (int *)malloc(sizeof(int)); 8 int *ptr3 = new int; 9 int *ptr4 = NULL; 10 11 /* delete Should NOT be used like below because x is allocated on stack frame */ 13 delete ptr1; 14 15 /* delete Should NOT be used like below because x is allocated using malloc() */ 17 delete ptr2; 18 19 /* Correct uses of delete */ 20 delete ptr3; 21 delete ptr4; 22 23 getchar(); 24 return 0; 25 }
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2013-11-26 10:00:24