just know 3 things: 1  Pointer is a variable that store the address of another variable (or just any address). * 2  is used to get the value at the memory location that is stored in the pointer variable. & 3  operator gives the address of a memory location.sually what I do is represent memory as a grid, so that I can make up addresses, highlight different memory spaces and write in the cells values (or even further, their binary representations) and link the pointers in memory to the values they point at.
The accepted rule of thumb is that if you're properly refrigerating it, your carton of whole milk's expiration date is five days after the sell-by date.
You're not exactly looking at an expiration date in the sense that the milk is going to die on that day- it's more like a last day to sell by date. As a general rule, unopened items are safe for up to 7 days after the date printed on the package. If it's opened, though- you are on your own time and it's anybody's guess.