[英]How do i fix this error? warning: implicit declaration of function ‘main_menu’
this is a b-day reminder code utilizing linkedlists 这是利用链表的b天提醒代码
typedef struct node
{
char name[61];
int month; int day;
int year;
struct node *next;
}node;
this is the list 这是清单
typedef struct list
{
node *head;
node *tail;
}list;
this is the create list code 这是创建列表代码
list *create_list(list *plist)
{
plist->head = NULL;
plist->tail = NULL;
return plist;
}
this inserts the node created to the list 这会将创建的节点插入列表
list *insert_list(list *plist, node *pnode, node *new_node)
{
new_node->next = pnode->next;
pnode->next = new_node;
if (plist->tail == pnode)
{
plist->tail = new_node;
}
}
this is the add birthday menu 这是添加生日菜单
void add_birthday(list *List)
{
char x;
node *data = (node *) malloc(sizeof(node));
List = (list*) malloc(sizeof(list));
printf("******************************************************************\n");
printf(" ADD BIRTHDAY REMINDER FORM\n");
printf("******************************************************************\n");
List = insert_list(List, data, create_node(data));
printf("Would you like to add another(y/n)?\n");
scanf("%c", &x);
if (x=='y')
{
while (x=='y')
{
if (x=='y')
{
getchar();
printf("******************************************************************\n");
node *data = (node *) malloc(sizeof(node));
List = insert_list(List, data, create_node(data));
printf("Would you like to add another(y/n)?\n");
scanf("%c", &x);
}
}
}
main_menu(List); //the problem lies here
}
this is the main menu 这是主菜单
void main_menu(list* List)
{
int x;
printf("Welcome to myCalendar version 1.0.0\n");
printf("Please input the number that you wish to do:\n");
printf("[1] Add Birthday Reminder\n");
printf("[2] Delete Birthday Reminder\n");
printf("[3] View Calendar\n");
printf("[4] Quit\n");
scanf("%d", &x);
getchar();
switch (x)
{
case 1:
add_birthday(List);
break;
case 2:
delete_reminder(List);
break;
case 3:
view_calendar(List);
break;
case 4:
free(List);
break;
}
}
this is the main 这是主要的
int main(void)
{
list* List = (list*) malloc(sizeof(list));
List = create_list(List);
main_menu(List);
return 0;
}
Is the definition of main_menu()
is after add_birthday()
? 是这样定义的main_menu()
是后add_birthday()
If yes define main_menu()
before add_birthday()
. 如果是定义main_menu()
之前add_birthday()
Also define all the methods before main()
or atleast declare them before main()
. 还要在main()
之前定义所有方法,或者在main()
之前至少声明它们。
您没有将包含main.menu()声明的* .h包含在包含main()或add_birthday()的* .c中,也没有将错误指向任何地方。
Have you declared main_menu? 您声明了main_menu吗? In the absence of declaration a function is assumed to return 'int'. 在没有声明的情况下,假定函数返回“ int”。 But, you function definition says, it is returning void. 但是,函数定义说,它正在返回void。 This is the cause of all the confusion. 这是所有混乱的原因。
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