memory-address

If we have code: int b = 10; int* a = &b; std::cout << a << " " << &a << " "; As the result, the addresses are different. But what's the meaning of address of a pointer? A pointer has the value of a variable's address, since we have a varaible in memory. But we don't have the value of address stored in memory, so why we have the address of an address? Maybe I have some misunderstandings, thank you for your help. Remember an address on your machine is going to be, itself, a 32 or 64-bit value (depending on your system architecture). In your example, you have the integer b that stores the value

The Background I am a student just beginning to learn MIPS for one of my courses, and my professor is not allowing the usage of pseudo-instructions such as Load Address ( la ) in our code. I am wondering what an example of the correct usage of standard instructions would look like to store the address of a declared variable into a register for use later in the code. My Solution I have currently been attempting to use this code, though I am getting a syntax error in the lui instruction. main: .data Array: .space 80 #Declares that Array will hold 20 integers .text lui $s0, Array #loads most

I am playing around with the c functions malloc and calloc and I have some questions. I want to see if I can use these 2 functions to allocate only physical memory, my mac has 4gb or ram and when I use malloc I can allocate way more than 4gb, which means malloc allocate both physical and virtual memory. I have a couple of questions: is there any function I can use, so that I can only allocate the physical memory (w/o allocating the virtual mem) when calling malloc and calloc and when the pointers return, is there any way I can use the pointers to determine how much physical memory are

Is it possible to assign a variable the address you want, in the memory? I tried to do so but I am getting an error as "Lvalue required as left operand of assignment". int main() { int i = 10; &i = 7200; printf("i=%d address=%u", i, &i); } What is wrong with my approach? Is there any way in C in which we can assign an address we want, to a variable? Not directly. You can do this though : int* i = 7200; .. and then use i (ie. *i = 10) but you will most likely get a crash. This is only meaningful when doing low level development - device drivers, etc... with known memory addreses. Assuming you