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C Basics
C Basics
Pointers
Using the reference operator &
and the dereference operator *
, we can create and work with pointers.
A pointer is a data type, just like int
, char
, or double
.
The pointer is designed to store an address, which you can obtain using the &
operator.
To declare a pointer, prepend it with the *
character.
In essence, a pointer is a variable that holds the address of another object.
Note
Typically, pointers are named by prefixing the letter
p
to the name of the object they're pointing to.
When you dereference a pointer, you access the value of the variable it points to.
Main
#include <stdio.h> int main() { int x = 22543; // variable int* pX = &x; // `pX` is pointer to `x` printf("The value of `pX` is %p\n", pX); // value of pointer `pX` printf("The value of `x` by pointer `pX` is %d\n", *pX); // pointer dereference return 0; }
Note
*(&variable) == *pVariable
If you attempt to dereference a null pointer, the compiler will raise an error:
Example provided to showcase the mistake
Main
#include <stdio.h> int main() { int* pX; printf("x = %p", pX); return 0; }
Завдання
Determine the size of int
and double
pointers.
Дякуємо за ваш відгук!
Pointers
Using the reference operator &
and the dereference operator *
, we can create and work with pointers.
A pointer is a data type, just like int
, char
, or double
.
The pointer is designed to store an address, which you can obtain using the &
operator.
To declare a pointer, prepend it with the *
character.
In essence, a pointer is a variable that holds the address of another object.
Note
Typically, pointers are named by prefixing the letter
p
to the name of the object they're pointing to.
When you dereference a pointer, you access the value of the variable it points to.
Main
#include <stdio.h> int main() { int x = 22543; // variable int* pX = &x; // `pX` is pointer to `x` printf("The value of `pX` is %p\n", pX); // value of pointer `pX` printf("The value of `x` by pointer `pX` is %d\n", *pX); // pointer dereference return 0; }
Note
*(&variable) == *pVariable
If you attempt to dereference a null pointer, the compiler will raise an error:
Example provided to showcase the mistake
Main
#include <stdio.h> int main() { int* pX; printf("x = %p", pX); return 0; }
Завдання
Determine the size of int
and double
pointers.
Дякуємо за ваш відгук!
Pointers
Using the reference operator &
and the dereference operator *
, we can create and work with pointers.
A pointer is a data type, just like int
, char
, or double
.
The pointer is designed to store an address, which you can obtain using the &
operator.
To declare a pointer, prepend it with the *
character.
In essence, a pointer is a variable that holds the address of another object.
Note
Typically, pointers are named by prefixing the letter
p
to the name of the object they're pointing to.
When you dereference a pointer, you access the value of the variable it points to.
Main
#include <stdio.h> int main() { int x = 22543; // variable int* pX = &x; // `pX` is pointer to `x` printf("The value of `pX` is %p\n", pX); // value of pointer `pX` printf("The value of `x` by pointer `pX` is %d\n", *pX); // pointer dereference return 0; }
Note
*(&variable) == *pVariable
If you attempt to dereference a null pointer, the compiler will raise an error:
Example provided to showcase the mistake
Main
#include <stdio.h> int main() { int* pX; printf("x = %p", pX); return 0; }
Завдання
Determine the size of int
and double
pointers.
Дякуємо за ваш відгук!
Using the reference operator &
and the dereference operator *
, we can create and work with pointers.
A pointer is a data type, just like int
, char
, or double
.
The pointer is designed to store an address, which you can obtain using the &
operator.
To declare a pointer, prepend it with the *
character.
In essence, a pointer is a variable that holds the address of another object.
Note
Typically, pointers are named by prefixing the letter
p
to the name of the object they're pointing to.
When you dereference a pointer, you access the value of the variable it points to.
Main
#include <stdio.h> int main() { int x = 22543; // variable int* pX = &x; // `pX` is pointer to `x` printf("The value of `pX` is %p\n", pX); // value of pointer `pX` printf("The value of `x` by pointer `pX` is %d\n", *pX); // pointer dereference return 0; }
Note
*(&variable) == *pVariable
If you attempt to dereference a null pointer, the compiler will raise an error:
Example provided to showcase the mistake
Main
#include <stdio.h> int main() { int* pX; printf("x = %p", pX); return 0; }
Завдання
Determine the size of int
and double
pointers.