#define _GNU_SOURCE    // really not portable!
#include <stdio.h>

typedef struct student_st {
  char * name;
  char * major;
  int    id;
} Student;

char * student_toString(Student *s) {
  char *str;
  if ( asprintf(&str, "Name: %s\nMajor: %s\nId: %d", 
                s->name, s->major, s->id
               ) < 0 ) return NULL;
  return str;
}


int main(int argc, char *argv[]) {
  Student example = { .name = "Alice",
                      .major = "CSE",
                      .id = 1
                    };

  printf("The example student:\n%s\n", student_toString(&example));

  return 0;
}