17.39
#include<iostream> #include<fstream> #include<string> #include<cstdlib> using namespace std; int main() { fstream inOut("copyOut",fstream::ate|fstream::in|fstream::out); if(!inOut) { cerr<<"Unable to open file!"<<endl; return EXIT_FAILURE; } auto end_mark=inOut.tellg(); inOut.seekg(0,fstream::beg); size_t cnt=0; string line; while(inOut&&inOut.tellg()!=end_mark&&getline(inOut,line)) { cnt+=line.size()+1; auto mark=inOut.tellg(); inOut.seekp(0,fstream::end); inOut<<cnt; if(mark!=end_mark) inOut<<" "; inOut.seekg(mark); } inOut.seekp(0,fstream::end); inOut<<‘\n‘; return 0; }
时间: 2024-10-13 22:43:49