c語言創建單鏈表

//創建單鏈表

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct Student STU; //用typedef 新定義結構體名字為 STU；
struct Student //定義時不能直接用STU
{
 char name[20];
 float score;
 STU* next;// 定義指向結構體的指針
};

int main()
{
 STU a, b, c, *P, *head;
 strcpy(a.name, "pan");
 a.score = 90;
 strcpy(b.name, "pan1");
 b.score = 96;
 strcpy(c.name, "pan2");
 c.score = 93;
 head = &a;
 P = head;
 a.next = &b;
 b.next = &c;
 c.next = NULL;

/* do
 {
  printf("%s %5.1f", P->name, P->score);
  P = P->next;
 } while (P != NULL);

 */
 while (P != NULL)
 {
  printf("%s %5.1f", P->name, P->score);
  P = P->next;
 };

 /* 注if的條件判斷只會執行一次，While 的條件才會循環判斷。
 if (P != NULL)
 {
  printf("%s %5.1f", P->name, P->score);
  P = P->next;
 }
 */
 return 0;
}