文档 所有空格变为Tab

遗憾的是记事本、word没有这个功能。。。

可以生成exe

 #include <cstdio>
 #include <cstdlib>
 #include <cmath>
 #include <cstring>
 #include <string>
 #include <algorithm>
 #include <iostream>
 using namespace std;
 #define ll long long

 const double eps=1e-;
 const ll inf=1e9;
 const ll mod=1e9+;
 const int maxn=1e5+;

 int main()
 {
     char c;
     FILE *in=fopen("in.txt","r");
     FILE *out=fopen("out.txt","w");
     while (~(c=fgetc(in)))
     {
         if (c==' ')
             fprintf(out,"\t");
         else
             fprintf(out,"%c",c);
     }
     fclose(in);
     fclose(out);
     return ;
 }