C语言用户注册和登录模块（文件版）
实例说明：
C语言，用户注册和登录模块（文件版）
实例代码：
#include <stdio.h>
#include <conio.h>
#include <windows.h>
#define ENTER 13
#define TAB 9
#define BKSPC 8
struct User {
char fullName[50];
char email[50];
char passWord[50];
char userName[50];
char phone[11];
};
void take_input(char ch[]) {
fgets(ch, 50, stdin);
ch[strlen(ch) - 1] = 0;
}
void generte_username(char email[], char username[]) {
//username[strlen(username)] ="\0";
for (int i = 0; i < strlen(email); i++) {
if (email[i] == '@') break;
else username[i] = email[i];
}
}
void take_password(char pwd[50]) {
int i = 0;
char ch;
while (1) {
ch = getch();
if (ch == ENTER || ch == TAB) {
pwd[i] = '\0';
break;
} else if (ch == BKSPC) {
if (i > 0) {
i--;
printf("\b \b");
}
} else {
printf("*");
pwd[i++] = ch;
}
}
}
int main() {
system("color 0b");
FILE *fp;
int opt;
struct User user;
char password2[50] = {0};
printf("\n\t\t\t\t----------Welcome to Student System----------");
printf("\nPlease choose your opertaion:");
printf("\n1.Signup");
printf("\n2.Login");
printf("\n3.Exit");
printf("\n\nYour choice:\t");
scanf("%d", &opt);
fgetc(stdin);
switch (opt) {
case 1:printf("\nEnter your name:\t");
take_input(user.fullName);
printf("Enter your email:\t");
take_input(user.email);
printf("Enter your contact number:\t");
take_input(user.phone);
printf("Enter your password:\t");
take_password(user.passWord);
printf("\nConfirm your password:\t");
take_password(password2);
if (!strcmp(user.passWord, password2)) {
generte_username(user.email, user.userName);
fp = fopen("User.dat", "a+");
fwrite(&user, sizeof(struct User), 1, fp);
if (fwrite != 0) {
printf("\n\nUser resgistration success!");
} else {
printf("\n\nsorry,Something went wron!");
}
} else {
printf("\nTwo passwords don't match!");
}
break;
case 2:char un[50] = {0};
char pwd[50] = {0};
struct User uer;
int userfonud = 0;
printf("\n\nEnter your username:\t");
take_input(un);
printf("\n\nEnter your password:\t");
take_password(pwd);
fp = fopen("User.dat", "r");
while (fread(&uer, sizeof(struct User), 1, fp)) {
if (!strcmp(uer.userName, un)) {
if (!strcmp(uer.passWord, pwd)) {
printf("\n\t\t\t\t Welcome %s", uer.fullName);
printf("\n\nFull Name:\t%s", uer.fullName);
printf("\n\nEmail:\t%s", uer.email);
printf("\n\nUsername:\t%s", uer.userName);
printf("\n\nContact numeber:\t%s", uer.phone);
} else {
printf("\n\n password wron");
}
userfonud = 1;
}
}
if (!userfonud) {
printf("\n\n User is not register");
}
break;
default:printf("\n\nPlease choose your opertaion:");
break;
}
system("pause");
return 0;
}