C Programming Pointers To Structures
Last modified by Microchip on 2023/11/09 09:06
Syntax
If typeName or structName has already been defined:
typeName *ptrName;
-or-
struct structName *ptrName;
-or-
struct structName *ptrName;
Example 1
1 typedef struct
2 {
3 float re;
4 float im;
5 } complex;
6 ...
7 complex *p;
2 {
3 float re;
4 float im;
5 } complex;
6 ...
7 complex *p;
Example 2
1 struct complex
2 {
3 float re;
4 float im;
5 }
6 ...
7 struct complex *p;
2 {
3 float re;
4 float im;
5 }
6 ...
7 struct complex *p;
Using a Pointer to Access Structure Members
Syntax
If ptrName has already been defined
ptrName -> memberName
Example: Definitions
1 typedef struct
2 {
3 float re;
4 float im;
5 } complex; complex type
6 ...
7 complex x; complex var
8 complex *p; ptr to complex
2 {
3 float re;
4 float im;
5 } complex; complex type
6 ...
7 complex x; complex var
8 complex *p; ptr to complex
Example: Usage
1 int main(void)
2 {
3 p = &x;
4 Set x.re = 1.25 via p
5 p->re = 1.25;
6 Set x.im = 2.50 via p
7 p->im = 2.50;
8 }
2 {
3 p = &x;
4 Set x.re = 1.25 via p
5 p->re = 1.25;
6 Set x.im = 2.50 via p
7 p->im = 2.50;
8 }
