Add hidenstruct

Author: DataEraserC

c/hidenstruct/main.c

@@ -0,0 +1,11 @@
+#include "stu.h"
+#include <stdio.h>
+
+
+int main() {
+  struct stu *s;
+  s = new_stu();
+  set_id(s, "114514");
+  printf("%s", get_id(s));
+  return 0;
+}

c/hidenstruct/stu.c

@@ -0,0 +1,13 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdlib.h>
+#include <string.h>
+struct stu {
+  char id[20];
+  int score;
+};
+struct stu *new_stu() {
+  struct stu *s = malloc(sizeof(struct stu));
+  return s;
+};
+void set_id(struct stu *s, const char *id) { strcpy(s->id, id); }
+char *get_id(struct stu *s) { return s->id; }

c/hidenstruct/stu.h

@@ -0,0 +1,7 @@
+#ifndef _STU_H
+#define _STU_H
+struct stu;
+extern struct stu *new_stu();
+extern void set_id(struct stu *s, const char *id);
+extern char *get_id(struct stu *);
+#endif // !_STU_H