什么保存了之后再读取然后输出就不对？？？？？？？？？
什么保存了之后再读取然后输出就不对？？？？？？？？？
#include <stdio.h>
#include <malloc.h>
#define NULL 0
#define LEN sizeof(struct student)
struct student
{long num;
char name[10];
float mat,eng,com,sum,aver;
struct student *next;
};
int n;
struct student *head;
struct student *creat(void)
{struct student *head;
struct student *p1,*p2;
n=0;
clrscr();
printf( "*************************CREAT*******************************\n\n ");
p1=p2=(struct student *)malloc(LEN);
printf( "please input name: ");
scanf( "%s ",p1-> name);
printf( "please input number: ");
scanf( "%ld ",&p1-> num);
printf( "please input math: ");
scanf( "%f ",&p1-> mat);
printf( "please input english: ");
scanf( "%f ",&p1-> eng);
printf( "please input computer: ");
scanf( "%f ",&p1-> com);
p1-> sum=p1-> mat+p1-> eng+p1-> com;
p1-> aver=p1-> sum/3;
head=NULL;
while(1)
{n=n+1;
if(n==1)head=p1;
else p2-> next=p1;
p2=p1;
p1=(struct student*)malloc(LEN);
printf( "please input name: ");
scanf( "%s ",p1-> name);
if((strcmp(p1-> name, "0 ")==0))return(head);
printf( "please input number: ");
scanf( "%ld ",&p1-> num);
printf( "please input math: ");
scanf( "%f ",&p1-> mat);
printf( "please input english: ");
scanf( "%f ",&p1-> eng);
printf( "please input computer: ");
scanf( "%f ",&p1-> com);
p1-> sum=p1-> mat+p1-> eng+p1-> com;
p1-> aver=p1-> sum/3;
}
p2-> next=NULL;
return(head);
}
void save(struct student *head)
{
FILE *fp;
struct student *p;
char outfile[30];
printf( "Enter outfile name,for example c:\\student\\c.txt:\n ");
scanf( "%s ",outfile);
if((fp=fopen(outfile, "wb "))==NULL)
{
printf( "can not open the file\npress angykey out!\n ");
getch();
exit(0);
}
printf( "\nSaving the file......\n ");
p=head;
while(p!=NULL)
{
fwrite(p,sizeof(LEN),1,fp);
p=p-> next;
}
fclose(fp);
printf( "-----save success!!-----\nenter anykey out!\n ");
getch();
}
struct student *load()
{
struct student *p,*q,*h=NULL;
FILE *fp;
char infile[30];
printf( "Enter infile name,for example c:\\student\\c.txt:\n ");
scanf( "%s ",infile);
if((fp=fopen(infile, "rb "))==NULL)
{
printf( "can not open file\nenter anykey out!\n ");
getch();
exit(1);
}
printf( "\n -----Loading file!-----\n ");
p=(struct student *)malloc(sizeof(LEN));
if(!p)
{
printf( "error!\n ");
return h;
}
h=p;
while(!feof(fp))
{
if(1!=fread(p,sizeof(LEN),1,fp))
break;
p-> next=(struct student *)malloc(sizeof(LEN));
if(!p-> next)
{
printf( "error!\n ");
return h;
}
q=p;
p=p-> next;
}
q-> next=NULL;
fclose(fp);
printf( "---Load success !!!---\nenter anykey out!\n ");
getch();
return h;
}
void print(struct student *head)
{struct student *p;
printf( "****************************ALL STUDENTS****************************\n ");
printf( "number name math english computer sum aver\n ");
p=head;
if(p!=NULL)
do
{printf( "%-10ld %-10s %-5.1f %-5.1f %-5.1f %-5.1f %-6.2f\n ",p-> num,p-> name,p-> mat,p-> eng,p-> com,p-> sum,p-> aver);
p=p-> next;
}while(p!=NULL);
printf( "press anykey out!\n ");
getch();
}
main()
{float aaa=9,b;
b=sqrt(aaa);
head=creat();save(head);head=load();print(head);}
[解决办法]
改为sizeof(struct student)就可以正常运行
[解决办法]
sizeof(LEN)
＝＝》
LEN
你的 LEN 宏定义不就是 结构体的长度么 ······
