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#include <stdio.h>
#include <stdlib.h>
 
struct TWICE{
  int value;
  struct TWICE *next;
};
 
int main(){
  int count, i;
  scanf("%d", &count); //指定能有幾個節點
 
  TWICE *head = new TWICE(); //取得一個和 TWICE 大小一樣的區塊，然後配給 head 這個指標
  int age;
  scanf("%d", &age);
}

prog.c: In function ‘main’:
prog.c:13:3: error: unknown type name ‘TWICE’
   TWICE *head = new TWICE(); //取得一個和 TWICE 大小一樣的區塊，然後配給 head 這個指標
   ^~~~~
prog.c:13:3: note: use ‘struct’ keyword to refer to the type
prog.c:13:17: error: ‘new’ undeclared (first use in this function)
   TWICE *head = new TWICE(); //取得一個和 TWICE 大小一樣的區塊，然後配給 head 這個指標
                 ^~~
prog.c:13:17: note: each undeclared identifier is reported only once for each function it appears in
prog.c:13:21: error: expected ‘,’ or ‘;’ before ‘TWICE’
   TWICE *head = new TWICE(); //取得一個和 TWICE 大小一樣的區塊，然後配給 head 這個指標
                     ^~~~~
prog.c:13:10: warning: unused variable ‘head’ [-Wunused-variable]
   TWICE *head = new TWICE(); //取得一個和 TWICE 大小一樣的區塊，然後配給 head 這個指標
          ^~~~
prog.c:10:14: warning: unused variable ‘i’ [-Wunused-variable]
   int count, i;
              ^

Standard output is empty