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#include<stdlib.h>
#include<stdio.h>
 
struct queue
{
    int data;
    struct queue *next;
};
 
queue* enqueue(queue *head, queue **tail, int num);
 
int main()
{
    int i;
    queue *head1=NULL;  //目前只宣告第一個queue 之後想再多加幾個
    queue *tail1=NULL;  //可能會命名為head2....
    queue *current=NULL;
 
    for(i=0; i<10; i++)
    {
        head1 = enqueue(head1, &tail1, i);
        current = head1;
 
        while(current != NULL)
        {
            printf("%d ", current->data);
            current = current->next;
        }
        printf("\n");
    }
 
    system("pause");
    return 0;
}
 
queue *enqueue(queue *head, queue **tail, int num)
{
    queue *newnode;
    newnode = (queue*)malloc(sizeof(queue));
    (*newnode).data = num;
 
    newnode->next = NULL;
 
    if(*tail == NULL)
        head = newnode;
    else
        (*tail)->next = newnode;
 
    *tail = newnode;
 
    return head;
}
 

prog.c:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
prog.c: In function ‘main’:
prog.c:15: error: ‘queue’ undeclared (first use in this function)
prog.c:15: error: (Each undeclared identifier is reported only once
prog.c:15: error: for each function it appears in.)
prog.c:15: error: ‘head1’ undeclared (first use in this function)
prog.c:16: error: ‘tail1’ undeclared (first use in this function)
prog.c:17: error: ‘current’ undeclared (first use in this function)
prog.c:21: warning: implicit declaration of function ‘enqueue’
prog.c:32: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result
prog.c: At top level:
prog.c:36: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token

Standard output is empty