加载动画

#include<iostream>
#include<windows.h>
using namespace std;int main(){cout<<endl<<endl<<endl<<endl<<endl<<endl<<endl<<endl<<endl;cout.widen(65);cout<<"系统正在加载中!请稍等！";for(int i=0;i<7;i++){printf(" .");Sleep(200);} return 0;
} 

实验结果图

实验代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<Windows.h>
#include<conio.h>
secret(char *secrets,int o)//输入密码 
{char ch;while((ch=getch())!='\r'){if(ch!='\b'){secrets[o++]=ch;printf("*");}else{if(o>0){printf("\b \b");o--;}}}printf("\n");secrets[o]='\0';return o;
}slength(char*secrets,int o)//检测密码长度 
{int m=1;while(m){if(o<3||o>20){printf("输入的密码长度不符合要求，请重新输入\n");o=0;o=secret(secrets,o);}else{m=0;}}return o ;
} 
int safety(char*secrets,int o)//检测是否为纯数字 
{int w=1,s=0;while(w){if(secrets[s]>='0'&&secrets[s]<='9'){s++;if(o==s){printf("只输入数字安全性太低，请重新输入\n");o=0;
//					o=secret(secrets,o);
//					o=slength(secrets,o);return 0;}}else{return 1;w=0;} }
} 
void gogogo()
{ 	char names[20],secrets[40];printf("1.登录\n2.注册\n3.退出\n");int choise,o=0;// while(1){scanf("%d",&choise);if(choise==1){char usernames[20],usersecrets[40];printf("请输入用户名："); scanf("%s",usernames);printf("请输入密码："); scanf("%s",usersecrets);if(strcmp(usernames,names)==0&&strcmp(usersecrets,secrets)==0){printf("登陆成功\n"); 	}}if(choise==2){char ch;printf("用户名不可超过10位，区分大小写\n");scanf("%s",names);while(1){printf("请设置3~20位的密码，字母区分大小写\n");o=secret(secrets,o);o=slength(secrets,o);if(safety(secrets,o)){printf("注册成功！\n");break;} else continue; }}if(choise==3){exit(0);}}
}
int main()
{//system("color 70");gogogo();return 0;
}