程式設計講義----PGM10-03.cpp

[Kenad (..大拇指腫歪歪..)]

#include <fstream.h>
#include <stdlib.h>
#include <iomanip.h>

const int MAXLENGTH = 21;   // maximum file name length
const int MAXCHARS = 31;    // maximum description length

char filename[MAXLENGTH] = "prices.dat";

int main()
{
  int ch;
  char descrip[MAXCHARS];
  float price;
  ifstream in_file;

  in_file.open(filename);

  if (in_file.fail())  // check for successful open
  {
    cout << "\nThe file was not successfully opened"
         << "\n Please check that the file currently exists."
         << endl;
    exit(1);
  }

    // set the format for the standard output stream
  cout << setiosflags(ios::fixed)
       << setiosflags(ios::showpoint)
       << setprecision(2);

  cout << endl;  // start on a new line

    // read and display the file's contents
  while ( (ch = in_file.peek()) != EOF ) // check next character
  {
    in_file >> descrip >> price;  // input the data
    cout << descrip << ' ' << price << endl;
  }

  in_file.close();

  return 0;
}

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