[GCC]struct_call_by_address

#include "stdio.h"
#include "string.h" // strcpy()

typedef struct
{
   int no;
   char name[10];
} student, *pstudent;

pstudent struct_call_by_address(pstudent pboy)
{
   pboy->no = 10;
   strcpy(pboy->name, "oomusou");
   printf("[in] function:\n");
   printf("no=%d, name=%s\n", pboy->no, pboy->name);
   printf("=====================\n");
   return pboy;
}

int main()
{
   student boy = {20, "John"};
   pstudent pboy = 0;

   printf("[before] function\n");
   printf("no=%d, name=%s\n", boy.no, boy.name);
   printf("=====================\n");
   pboy = struct_call_by_address(&boy);
   printf("[after] function\n");
   printf("*boy*  no=%d, name=%s\n", boy.no, boy.name);
   printf("*pboy* no=%d, name=%s\n", pboy->no, pboy->name);
   printf("=====================\n");
}

=====Result=====