C + + file reading and writing exercises

Source: Internet
Author: User

编写一个程序,统计data.txt文件的行数,并将所有行前加上行号后写到data1.txt文件中。 算法提示: 行与行之间以回车符分隔,而getline()函数以回车符作为终止符。因此,可以采用getline()函数读取每一行,再用一个变量i计算行数。   (1)实现源代码     #include <iostream> #include <fstream> #include <string> #include <sstream>   using namespace std;   int coutFile( char * filename, char * outfilename) {      ifstream  filein;      filein.open(filename,ios_base::in);      ofstream  fileout;      fileout.open(outfilename,ios_base::out);      string strtemp;      int count=0;      while (getline(filein,strtemp))      {          count++;          cout<<strtemp<<endl;          fileout<<count<< " " <<strtemp<<endl;      }      filein.close();      fileout.close();      return count; }     void main() {      cout<<coutFile( "c:\\data.txt" , "c:\\data1.txt" )<<endl; }

C + + file reading and writing exercises

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