关于文件操作
我编写的一个关于C语言文件操作的程序段,但是运行却得不到预期结果,调试过感觉是输入输出文件操作那个地方出错,但是却不知道错在哪里,请大家帮忙看下,谢谢了!!
其他操作函数我没写上,就下面这个程序段,大家帮忙看看!!
#include <stdio.h>
#include <stdlib.h>
struct student /* 学生档案 */
{ char num[10]; /* 学号 */
char name[12]; /* 姓名 */
char sex[4]; /* 性别 */
char tel[15]; /* 电话 */
char addr[50];
};
char filename[30]; /* 学生信息表名 */
FILE *fp;
void ListCreate(); /* 建立信息表 */
void ListAdd(); /* 添加 */
void ListSearch(); /* 查找 */
void ListModify(); /* 修改 */
void ListDelete(); /* 删除 */
void ListPrint(); /* 输出 */
void exit(); /* 退出 */
/*------------------------------------主函数----------------------------------------*/
void main()
{ struct student stu; /* 链表结构体变量*/
int n;
ListCreate();
while(1)
{ printf( "\nAdd :(Please enter 1) ");
printf( "\nSearch:(Please enter 2) ");
printf( "\nUpdate:(Please enter 3) ");
printf( "\nDelete:(Please enter 4) ");
printf( "\nCount :(Please enter 5) ");
printf( "\nOrder :(Please enter 6) ");
printf( "\nOutput:(Please enter 7) ");
printf( "\nQuit :(Please enter 0) ");
printf( "\nPlease Choose: ");
scanf( "%d ",&n);
if((n> =0)&&(n <=5))
{ switch(n)
{ /* case 1: ListAdd(); break; 添加 */
case 2: ListSearch(); break; /* 查找 */
case 3: ListModify(); break; /* 修改 */
case 4: ListDelete(); break; /* 删除 */
case 5: ListPrint(); break; /* 输出 */
case 0: exit(0);
}
printf( "\n\nFinish!Please chose again... ");
}
else
printf( "\n\nFalse!Please chose again... ");
}
}
/*--------------------------------创建学生资料----------------------------------*/
void ListCreate()
{ struct student stu;
char ch;
printf( "\nPlease enter the name of the students information system: ");
scanf( "%s ",filename);
if((fp=fopen(filename, "w "))==NULL)
{ printf( "\nSorry,you couldn 't create the students information system! ");
exit(0);
}
fprintf(fp, "%-15s%-15s%-10s%-20s%-50s\n ", "NUM ", "NAME ", "SEX ", "TEL ", "ADDR ");
printf( "\nPlease enter number,name,sex,telephone and address(Enter 0 in the end)\n ");
scanf( "%s ",stu.num);
getchar();
while(ch!= '0 ')
{ scanf( "%s ",stu.name);
getchar();
scanf( "%s ",stu.sex);
getchar();
scanf( "%s ",stu.tel);
getchar();
scanf( "%s ",stu.addr);
getchar();
fprintf(fp, "%-15s%-15s%-10s%-20s%-50s%\n ",stu.num,stu.name,stu.sex,stu.tel,stu.addr);
ch=getchar();
if(ch!= '0 ')
{ scanf( "%s ",stu.num);
getchar();
}
}
fclose(fp);
}
/*-------------------------------显示输出学生资料-------------------------------*/
void ListPrint()
{ struct student stu;
if((fp=fopen(filename, "r "))==NULL)
{ printf( "\nSorry,you can 't open the students information system! ");
exit(0);
}
printf( "\n\n%40s\n\n ", "The Students Information System ");
while(!feof(fp))
{
fscanf(fp, "%s ",stu.num);
fscanf(fp, "%s ",stu.name);
fscanf(fp, "%s ",stu.sex);
fscanf(fp, "%s ",stu.tel);
fscanf(fp, "%s ",stu.addr);
printf( "%-15s%-15s%-10s%-20s%-50s\n ",stu.num,stu.name,stu.sex,stu.tel,stu.addr);
}
fclose(fp);
}
[解决办法]
一般源数据都是用文件读入,好判断一点.呵呵,我也不知道怎么输入才是最好!
不过我看问题会不会出在这里啊,我的猜测,因为我以前也犯过这个错误:scanf只能读入连续的字符串,到回车或者空格结束.这里你用scanf进行字符串读入恐怕会有问题,你能确保那些名字,地址字符串中间都没有空格?
