C malloc

Is a C function to allow memory allocation to the OS Heap. Requires stdlib.h malloc syntax is as follows: (type*)malloc(size_t).

• size_t - unsigned integer representing size to allocate
• type* is what the pointer is typecasted to. It returns pointer as void type automatically, then you can change the type like int* or char* instead of void*. Memory addresses can be found by adding # of bytes a datatype has to another address. Reading the data is accessed using pointers.

Example

int *ptr = (int*)malloc(5 * sizeof(int));

Malloc for Structs

struct ListNode *retll = (struct ListNode*)malloc(sizeof(struct ListNode) * 2);