>729 すみません…　本当に何も理解しておりません。
>実行結果です。
t23.c: In function `insert_node':
t23.c:130: error: `new' undeclared (first use in this function)
t23.c:130: error: (Each undeclared identifier is reported only once
t23.c:130: error: for each function it appears in.)
t23.c:130: error: parse error before "node_t"
t23.c: In function `remove_node':
t23.c:139: error: `delete' undeclared (first use in this function)
t23.c:139: error: parse error before "del"
t23.c: In function `random_list':
t23.c:149: error: 'for' loop initial declaration used outside C99 mode
t23.c: In function `get_node':
t23.c:155: error: 'for' loop initial declaration used outside C99 mode