14th Week Reader Program 1: File stream

Questions and codes:

#include <iostream> #include <fstream>using namespace Std;int main () {    fstream outfile,infile;    Defines the file stream object    outfile.open ("Data.dat", ios::out);       Open file as output data,dat    outfile<< "1111111111" <<endl;             Save string to disk File  data.dat    outfile<< "aaaaaaaaaa" <<endl;    outfile<< "AAAAAAAAAA" <<endl;    outfile<< "**********" <<endl;    Outfile.close ();           Close Disk File  Data.dat    infile.open ("Data.dat", ios::in);         Open file as input data,dat    char line[80];    int i=0;    while (!infile.eof ())       //successfully opening the file    {        i++;        Infile.getline (line,sizeof (line));   Get data for each row        cout<<i<< ":" <<line<<endl;    }    Infile.close ();            Close Disk File  Data.dat    return 0;}

Operation Result:

After execution, a Data.dat file is generated in the program folder

Open the file in Notepad to see the result is the input result

Run the results, see the output of a total of five elements, and in the Data.dat file only four lines, that is because the last line of the Data.dat file has a carriage return character

Summary of Knowledge points:
When using the file stream, the first header file #include <fstream>

Then define an object

Ios::in open file in input mode

Ios::out Open the file as output, and if it already has a file of that name, delete its original content

Infile.getline (line,sizeof (line)); Get the data for each row

14th Week Reader Program 1: File stream