Program explanation.

[nullifyed]

Can anyone explain this program?

 
#include <stdio.h>

#include <stdlib.h>



struct Person{

	   char name[20];

	   int age;

};



struct Person int_age(struct Person x){

	   x.age = x.age + 1;

	   return x;

};



void changeName(char *arg_name, char *new_name){

	 strcpy(arg_name, new_name);

}



int main(void){

	   struct Person a = {"Yorikas", 10};

	   struct Person c; // struct Person = c !

	   c = int_age(a);

	   printf("c: %d A: %d \n", c.age, a.age);

	   changeName(a.name, "kostikas");

	   printf("%s\n", a.name);
	   

return 0;

}

[MK27]

	   struct Person a = {"Yorikas", 10};

This just initializes the struct with those values.

[nullifyed]

Finally we got two struct? The first named 'a' and the second 'c'?

[claudiu]

Yes, there are two instances of type struct Person. One of the variables is called a, and the other is called c. It's no different than when you are calling two integers a and c:

int a;
int c;

A struct is nothing more but a complex data type which is made up of primitive data types and/or other nested structs.