Pointers Brief Overview
To go through the following chapters, I suggest briefly repeating the pointers in the C programming language.
Note
If you are not familiar with the basic skills of working with the C programming language, we recommend taking our basic C programming language course: C Basic
Dereferencing Operator
A pointer is a variable that contains the address of another object.
Dereference operator "*" returns the value stored at the address.
Declaring and initializing a pointer looks like this:
main.c
#include <stdio.h> int main() { int* pName = NULL; printf("%p\n", pName); // `%p` is a specifier for a pointer return 0; }
Referencing Operator &
The "&" operator returns the address of an object:
main.c
#include <stdio.h> int main() { int variable; printf("%p\n", &variable); return 0; }
A variable of pointer type is used to store the address, which is returned by the & operator.
To "unpack" the contents at the specified address, you must use the * operator on a variable of type pointer.
main.c
#include <stdio.h> int main() { int variable = 1024; int* pVariable = &variable; printf("Address: %p\n", pVariable); // `%p` specifier for a pointer printf("Returned value by address: %d\n", *(pVariable)); // using `*` to pointer return 0; }
Swipe to start coding
- Declare and initialize any variable with any value;
- Declare a pointer to the same data type as your variable;
- Assign the address of a variable to a pointer;
- Display an address of your variable;
- Display the value of the variable by the pointer.
Oplossing
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