C int* pInt = NULL; To check for a null pointer before Strictly speaking, NULL expands to an implementation-defined null pointer constant which is defined in many header files such as stdio.h, stddef.h, stdlib.h etc. In C, NULL is limited to identifying a null pointer. A lot of confusion about C pointers comes from a very bad choice that was originally made regarding coding style, corroborated by a very bad little Initialization of pointers - IBM Following are some most common uses of the NULL pointer in C: It is a valid operation in pointer arithmetic to check whether the pointer is NULL. Web3/7: The first node in the linked list is called the head. int *my_int_ptr = 2 stores the integer value 2 to whatever random address is in my_int_ptr when it is allocated. This is completely wrong. If this Programmer4241R on Twitter: "3/7: The first node in the linked list According to C11 standard: An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant. c++ - How to initialize a pointer to null - Stack Overflow return EXIT_SUCCESS; By specifically mentioning the NULL pointer, the C standard gives a mechanism using which a C programmer can check whether a given pointer is legitimate or not. Is it possible to initialize a C pointer to NULL? Is it possible to initialize a C pointer to NULL? TL;DR Yes, very much. The actual claim made on the guide reads like On the other hand, if you if (x==NULL) } To clarify why the tutorial is wrong, int *my_int_ptr = 2; is a "constraint violation", it is code which is not allowed to compile and the compil Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isnt assigned
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