Learning point C language (24): Data Type-structure (struct)

1. The structure is a set of multiple variables:

 
# Include <stdio. h> int main (void) {struct rec {int X; int y ;}; struct rec R1; r1.x = 111; r1.y = 222; printf ("% d, % d ", r1.x, r1.y); getchar (); Return 0 ;}

  
 

2. Declare variables at the same time during definition:

 
# Include <stdio. h> int main (void) {struct rec {int X, Y;} R1, R2; r1.x = 111; r1.y = 222; r2.x = 333; r2.y = 444; printf ("% d, % d \ n", r1.x, r1.y); printf ("% d, % d \ n", r2.x, r2.y); getchar (); return 0 ;}

  
 

3. Declare variables and assign values when defining them:

 
# Include <stdio. h> int main (void) {struct rec {int X, Y;} R1 = {777,888}; printf ("% d, % d \ n", r1.x, r1.y ); getchar (); Return 0 ;}

  
 

# Include <stdio. h> int main (void) {struct rec {char name [12]; short age;} R1 = {"zhangsan", 12}; printf ("% s, % u ", r1.name, r1.age); getchar (); Return 0 ;}

  
 

4. The declared variable is the initial value assigned:

 
# Include <stdio. h> int main (void) {struct rec {char name [12]; short age ;}; struct rec R1 = {"zhangsan", 12}; printf ("% s, % u ", r1.name, r1.age); getchar (); Return 0 ;}

  
 

5. assigning values to strings after declaration is troublesome:

 
# Include <stdio. h> # include <string. h> int main (void) {struct rec {char name [12]; short age ;}; struct rec R1; strcpy (r1.name, "zhangsan"); r1.age = 18; printf ("% s, % u", r1.name, r1.age); getchar (); Return 0 ;}

  
 

6. If you declare variables directly during definition, You can omit the structure Name:

 
# Include <stdio. h> int main (void) {struct {char name [12]; short age;} R1 = {"zhangsan", 12}; printf ("% s, % u ", r1.name, r1.age); getchar (); Return 0 ;}

  
 

7. assign values through scanf:

 
# Include <stdio. h> int main (void) {struct rec {char name [12]; short age;} R1; printf ("name:"); scanf ("% s ", r1.name); printf ("Age:"); scanf ("% d", & r1.age); printf ("Name: % s; age: % d", r1.name, r1.age); getchar (); Return 0 ;}