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我创建了下列链接列表,它从文件中读取数据,然后动态地将值分配给链接列表(例如,通过在全名中提供A来初始化它)我希望列表成为功能外可用,但我想我有一个问题存在。 通过尝试打印列表内主,我有什么.. 我的代码如下C和函数中的链接列表
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int i,j,numberofseats,temp;
char platenr[8],selection;
char firstname[20],lastname[20];
char phone[11];
char *p;
typedef struct psg
{
char fullname[40];
unsigned short phonenr[10];
unsigned int seatnr;
struct psg *next
}PASSENGERS;
void readfile(char *platenr, int *seatnr, PASSENGERS *passenger, PASSENGERS *tmp, PASSENGERS *start)
{
char buff[60];
FILE *businfo;
businfo = fopen ("bus.txt","r");
if (businfo == NULL)
{
printf("Error Opening File, check if file bus.txt is present");
exit(1);
}
else
{
fscanf(businfo,"%s %d",platenr, seatnr);
printf("Bus Licence plate Nr is: %s, and Number of Seats is: %d", platenr, *seatnr);
for (i=0;i<numberofseats;i++)
{
passenger = (PASSENGERS *) malloc (sizeof(PASSENGERS));
if (passenger==NULL) /*elegxos orthis desmeysis mnimis*/
{
puts("Unable to allocate memory");
exit(1);
}
passenger->next=NULL;
strcpy (passenger->fullname,"A");
passenger->seatnr=i+1;
for (j=0;j<10;j++)
passenger->phonenr[j]=0;
if (start==NULL)
start=passenger;
else{
tmp=start;
while (tmp->next !=NULL) tmp=tmp->next;
tmp->next=passenger;
}
}
}
}
int main()
{
PASSENGERS *passenger, *tmp, *start=NULL;
readfile(platenr,&numberofseats, passenger,tmp, start);
tmp=start;
while(tmp!=NULL)
{
printf ("%s",tmp->fullname);
tmp=tmp->next;
}
}
需要注意的是[多余的,有潜在危险的投malloc和朋友的结果在C](http://stackoverflow.com/q/605845/253056)。 –
乍一看,请确保你的新行是你的'printf',否则缓冲区将不会被刷新:'printf(“%s \ n”,tmp-> fullname);' –
请发布你到目前为止的输出结果。 –