细细理解

1 #include 
     
       2 #include 
      
        3 #include 
       
         4 #include 
        
          5 #include 
         
           6 #include 
          
            7 #include 
           
             8 using namespace std; 9 struct film{10 char title[45];11 int rating;12 struct film * next;13 };14 int main()15 {16 struct film * head = NULL;17 struct film * prev, * current;18 char input[45];19 20 puts("enter first movie title: ");21 while(gets(input) != NULL && input[0] != '\0'){22 current = (struct film *)malloc(sizeof(struct film));23 if(head == NULL)24 head = current;25 else26 prev->next = current;27 current->next = NULL; 28 strcpy(current->title,input);29 puts("rating : ");30 scanf("%d",&current->rating);31 while(getchar() != '\n')32 continue;33 puts("enter next movie title : ");34 prev = current;35 }36 if(head == NULL)37 printf("NO data entered.");38 else39 printf("Here is the movie list: \n");40 current = head;41 while (current != NULL)42 {43 printf("Movie: %s Rsting: %d\n",current->title,current->rating);44 current = current->next;45 }46 current = head;47 while (current != NULL)48 {49 free(current);50 current = current->next;51 }52 printf("Bye!\n");53 return 0;54 }