//自己早上看到你这个问题专门为你写的 趁热看看
Registered and Login system
1 UserReg
2 Login
3 Exit
1
Registered Account:
Please input your name:
ka西瓜
Please input your password:
123456
Registered Success!
Registered and Login system
1 UserReg
2 Login
3 Exit
2
Login Account:
Please input Username:
ka西瓜
Please input Password:
123456
OK!Login Success!
Welcome back,ka西瓜!
Press any key to continue
#include
#include
void UserReg(); //用户注册函数
void Login(); //用户登录函数
main()
{
int selectNum;
printf("\nRegistered and Login system\n\n");
printf("1 UserReg\n");
printf("2 Login\n");
printf("3 Exit\n");
scanf("%d",&selectNum);
switch (selectNum)
{
case 1:UserReg();
break;
case 2:Login();
break;
case 3:printf("Exit Program!\n");
exit(1);
break;
}
}
void UserReg()
{
FILE *fp;
char Linedata[50]={0},User[20],Pass[20];
fp = fopen("data.dat","at");
printf("Registered Account:\n");
printf("Please input your name:\n");
fflush(stdin);
gets(User);
printf("Please input your password:\n");
fflush(stdin);
gets(Pass);
strcpy(Linedata,User);
strcat(Linedata,",");
strcat(Linedata,Pass);
strcat(Linedata,"\n");
fputs(Linedata,fp);
fclose(fp);
printf("Registered Success!\n");
main();
}
void Login()
{
FILE *fp;
int find=0;
char User[20],Pass[20],Userstrcat[50]={0};
char Userdata[50]={0};
fp = fopen("data.dat","r");
printf("Login Account:\n");
printf("Please input Username:\n");
fflush(stdin);
gets(User);
printf("Please input Password:\n");
fflush(stdin);
gets(Pass);
strcpy(Userstrcat,User);
strcat(Userstrcat,",");
strcat(Userstrcat,Pass);
strcat(Userstrcat,"\n");
while (!feof(fp))
{
fgets(Userdata,19,fp);
if (strcmp(Userdata,Userstrcat)==0 )
{
printf("OK!Login Success!\n");
printf("Welcome back,%s!\n",User);
find=1;
break;
}
}
if (!find)
{
printf("Username or Password incorrect!\n");
}
fclose(fp);
}
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