lesson 5 pointers

Stack vs Heap-- stack de-allocates and is fast but cannot be resized; heap has to be allcoated and can memory leak

malloc(size): generates array of particular size
calloc(num,size): generates array of num elements, each of size size, and initializes everything to 0
realloc(ptr, size): reallocates size at ptr

free(ptr): frees memory of pointer

Carl lives in a house, dug points to carl
int carl = 1; int *dug = &carl;