做个系统登陆模板，懵的一批求大哥指点
int shuru() //正确返回1，错误返回0{
char mi;
int i;
FILE *fp;
ATMSYTEM at;
char zhang; fp = fopen( "atmsy.dat", "rb" );
flag = 0;
printf("\n\t ================欢迎进入用户登陆系统===============\n");
while(1) //循环录入用户信息
{
printf("\n请输入账号(0_退出)：");
scanf("%s",zhang); if(zhang == '0')
{
return 0; //退出系统，不进入主菜单
}
while(fread(&at,sizeof(ATMSYTEM),1,fp) != 0) //查找用户账号是否存在
{
if(strcmp(zhang,at.zhanghao) == 0) //该用户存在
{
flag = 1;
break;
}
}
rewind(fp); //文件指针回到开头 if(flag) //若是该用户存在，那么输入密码
{
for( i = 0; i < 3; i++) //3次机会输入密码
{
printf("\n请输入密码：");
scanf("%s",mi);
while(fread(&at,sizeof(ATMSYTEM),1,fp) != 0) //核对密码
{
if(strcmp(mi,at.password) == 0) //该密码存在
{
return 1;
}
}
rewind(fp); //不停返回文件开头，核对密码
}
printf("密码输错3次！无法登陆系统！\n");
getch();
return 0;
} if(flag == 0)
{
printf("输入账号错误，请重新输入\n");
getch();
}
}
}
出现懵懵的错误，求各位老大哥帮帮忙，谢谢了
：-------------------Configuration: ce shi - Win32 Debug--------------------
Compiling...
1.cpp
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(5) : error C2065: 'FILE' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(5) : error C2065: 'fp' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(5) : warning C4552: '*' : operator has no effect; expected operator with side-effect
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(6) : error C2065: 'ATMSYTEM' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(6) : error C2146: syntax error : missing ';' before identifier 'at'
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(6) : error C2065: 'at' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(7) : error C2065: 'fopen' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(8) : error C2065: 'flag' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(9) : error C2065: 'printf' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(13) : error C2065: 'scanf' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(17) : error C2065: 'fread' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(19) : error C2065: 'strcmp' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(19) : error C2228: left of '.zhanghao' must have class/struct/union type
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(25) : error C2065: 'rewind' : undeclared identifier
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(33) : error C2228: left of '.password' must have class/struct/union type
G:\Microsoft Visual Studio\MyProjects\ce shi\1.cpp(41) : error C2065: 'getch' : undeclared identifier
执行 cl.exe 时出错.
ce shi.exe - 1 error(s), 0 warning(s)
没有包含头文件啊，#include <stdio.h>
另外ATMSYTEM是你程序定义的吗，把这个头文件也包含进来。 superbe 发表于 2019-9-5 11:28
没有包含头文件啊，#include
另外ATMSYTEM是你程序定义的吗，把这个头文件也包含进来。
#include <stdio.h>这个头文件加上去也运行不了{:10_266:} 我测试的代码，可以编译，参考一下吧
#include <stdio.h>
#include <string.h>
#include <conio.h>
typedef struct
{
char zhanghao;
char password;
}ATMSYTEM;
int shuru() //正确返回1，错误返回0
{
char mi;
int i;
FILE *fp;
ATMSYTEM at;
char zhang;
fp = fopen( "atmsy.dat", "rb" );
int flag = 0;
printf("\n\t ================欢迎进入用户登陆系统===============\n");
while(1) //循环录入用户信息
{
printf("\n请输入账号(0_退出)：");
scanf("%s",zhang); if(zhang == '0')
{
return 0; //退出系统，不进入主菜单
}
while(fread(&at,sizeof(ATMSYTEM),1,fp) != 0) //查找用户账号是否存在
{
if(strcmp(zhang,at.zhanghao) == 0) //该用户存在
{
flag = 1;
break;
}
}
rewind(fp); //文件指针回到开头 if(flag) //若是该用户存在，那么输入密码
{
for( i = 0; i < 3; i++) //3次机会输入密码
{
printf("\n请输入密码：");
scanf("%s",mi);
while(fread(&at,sizeof(ATMSYTEM),1,fp) != 0) //核对密码
{
if(strcmp(mi,at.password) == 0) //该密码存在
{
return 1;
}
}
rewind(fp); //不停返回文件开头，核对密码
}
printf("密码输错3次！无法登陆系统！\n");
getch();
return 0;
} if(flag == 0)
{
printf("输入账号错误，请重新输入\n");
getch();
}
}
}
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