Pointers in C/C++ are used to store memory addresses and manipulate them. So, how can we check what data a pointer is pointing to or how can we find out the memory address of a pointer? I want to delve deeper into the fundamental principles of pointers.
How do pointers work in memory?
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The most basic and practical way to understand how pointers work in C/C++ is to use the `&` (address operator) to get a variable’s memory address and the `*` (dereference operator) to read/manipulate the data at that address. For example:
```c
int x = 42;
int *ptr = &x; // ptr holds the memory address of x
printf("Address: %p\n", (void*)ptr); // prints something like 0x7ffd...
printf("Value: %d\n", *ptr); // prints 42
```
In the code I take the address of `x` with `&x` and assign it to the pointer `ptr`, then I can reach the value at that address with `*ptr`. With this approach you can both verify which data the pointer is pointing to and inspect the memory address in the console output. For a deeper understanding, I recommend also looking at how pointers interact with arrays and structs.