在这里纠正你一个拼写错误，在第二行，“argc"你写成“argv",还有你给出的程序在纠正了这个拼写错误之后，还是在第二行报错。错误的具体是：Multiple declaration for 'argc'

对楼上高手提出的问题我感到很困惑，希望高手解答下~

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct node *create();

struct node
{
    int     numberical;
    long serialnumber;    
    char sort;
    char date[10];
    struct node *next;
};
struct node *create()
{
    FILE *fp;
    struct node *head, *tail, *p;
    char bal[30];
    int i,j=0,n=0;
    int max=0;
    head = tail =NULL;
    
    if(!(fp = fopen("test.txt","r")))
    {
        printf("cannot open file,\n");
        exit(1);
    }
    while(!feof(fp))
    {    
        p = (struct node *)malloc(sizeof(struct node));
        n=0;
        j=0;
        if(fgets(bal,19,fp))
        {
            for(i=0;i<(int)strlen(bal);i++)
            {
                if(i == 0)
                    p -> numberical = bal[i]-'0';
                else if(i>1 && i<10)
                {
                    n = n*10+bal[i]-'0';
                    p -> serialnumber = n;
                }
                else if(i>10 && i<12)
                    p -> sort = bal[i];
                else if(i>12 && i<17)
                {
                    p -> date[j] = bal[i];
                    j++;
                }
            }
            p -> date[4]='\0';
            p -> next = NULL;
            if(head == NULL)
                head = tail = p;
            else
            {
                tail -> next = p;
                tail = p;
            }
        }
    }
    fclose(fp);
    return(head);
}
int main(void)
{
    struct node *q;
    q=create();
    while(q != NULL)
    {
        printf("%d ",q -> numberical);
        printf("%ld ",q -> serialnumber);
        printf("%c ",q -> sort);
        printf("%s",q -> date);
        q = q -> next;
        printf("\n");
    }    
    return 0;
}
/* 以下是test.txt文本文件保持原来格式*/
1 20080909 R 88.7
2 30080909 f 89.8
3 40080909 e 89.9
4 50080909 g 90.9
5 60080909 h 100

请问什么是“重定向”

生成.exe文件
在命令行 test > data /* 输入到文件*/