项目一

#include <iostream>#include <cstdlib>#include <fstream>using namespace std;int main(){    fstream outfile,infile;    infile.open("abc.txt",ios::in); // (1)    if(!infile) {        cout<<"Can’t open the file."<<endl;        abort();    }   outfile.open("newabc.txt",ios::out);//(2)    if(!outfile) {        cout<<"Can’t open the file."<<endl;        abort();    }    char buf[80];    int i=1;    while(!infile.eof()) // (3)    {        infile.getline(buf,80); // (4)        outfile<<i++f<<": "<<buf<<endl; //(5)    }    infile.close();    outfile.close();    return 0;}