用c++写文本（.txt）文件编辑器

#include<iostream>#include<windows.h>#include<string>#include<fstream>using namespace std;char file[100];void qk(){ofstream qingkong(file);qingkong.close();return;}int main(){system("title 文本编辑器");string cnt;bool flag=false;int sum=1;cout<<"请输入文件名"<<endl;cin>>file;strcat(file,".txt");ifstream fin(file);if(fin){if(MessageBox(NULL,"此文件已存在，是否清空？","提示",MB_YESNO)==6){qk();}}ofstream fout(file,ios::app);if(MessageBox(NULL,"是否启动标行模式？","询问",MB_YESNO)==6){flag=true;}while(getline(cin,cnt)){if(cnt=="exit"){if(MessageBox(NULL,"是否退出","提示",MB_YESNO)==6){return 0;}}if(flag){fout<<sum<<" ";sum++;}fout<<cnt<<endl;}return 0;}