// xitong.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <stdio.h>#include <string.h>#include <stdlib.h>int main(int argc, char* argv[]){ char user[10]; char passkey[10]; int xuan; int fanhuizhi; int cuowu char iduser[10]; char idkey[10]; char idput[10]; char keyput[10]; printf("****************************歡迎登錄學生管理系統********************************\n"); printf("**********************************1.登錄********************************\n"); printf("**********************************2.注冊************************************\n"); printf("******************************請輸入您的選項****************************\n"); scanf("%d",&xuan);? switch(xuan)? {? ? case 1: ?{ ?printf("請輸入您的帳號\n"); ?scanf("%s",&iduser); ?FILE *fp; ?fp = fopen("E:\\class test\\0104\\xiangmu\\user.txt","r");? ?fgets(idput,2,fp); ?fanhuizhi = strcmp(idput, iduser); ?if(fanhuizhi ==0;) ?{ ?printf("請輸入您的密碼\n"); ?scanf("%s",&idkey); ?FILE *fp; ? ? ?fp = fopen("E:\\class test\\0104\\xiangmu\\user.txt","r");? ?fgets(keyput,2,fp); ?fanhuizhi = strcmp(keyput, idkey); ?if(fanhuizhi ==0;) ?{ ?printf("登錄成功，歡迎使用!\n"); ?void zhucaidan(); ? ? ?zhucaidan(); ?} ?else if(int cuowu=3;cuowu>=0;cuowu--) ?{ ?printf("登錄失敗，請重新輸入!\n"); ?} ?} ?} ? ?else ?{ ?printf("您輸入的帳號不存在\n"); ?} ?}? } ?break; ?} case 2: { printf("請輸入您注冊的帳號"); scanf("%s",&user); FILE *fp; fp = fopen("E:\\class test\\0104\\xiangmu\\user.txt","a");? fputs(user,fp); fclose(fp); printf("請輸入您注冊的密碼"); scanf("%s",&passkey); fp = fopen("E:\\class test\\0104\\xiangmu\\user.txt","a"); fputs(passkey,fp); fclose(fp); printf("恭喜你，注冊成功!\n"); void zhucaidan(); zhucaidan(); } } ? return 0;}void zhucaidan(){ printf("**********1、錄入學生信息*********\n"); printf("**********2、顯示學生信息*********\n"); printf("**********3、查詢學生信息*********\n"); printf("**********4、修改學生信息*********\n"); printf("**********5、刪除學生信息*********\n"); printf("**********6、退出管理系統*********\n");}麻煩大牛看看 我已經把viod函數聲明在登錄成功之后 ??