Sample Program: Search (Uses a Flag)

//  This program searches a file for a given number.
//  The program will prompt the user to enter a number. It will then
//  read the file numbers.dat, and search for the number entered by the
//  user. At the end of the search the program will print a message telling
//  whether the number was found.

#include <iostream.h>
#include <iomanip.h>
#include <fstream.h>
#include <csstring.h>  //  only needed in Turbo C++

int main()
{
   int number;
   int searchnum;
   int i;
   bool found = false;
   ifstream numfile;

//  prompt the user to enter the number they are looking for
   cout << "Enter the number to search for: ";
   cin >> searchnum;

//  open the input file
   numfile.open("numbers.dat");

//  read in first number from the file
   numfile >> number;

//  read in the numbers, check for the user's number
   while (numfile)
   {
      if (number == searchnum)
         found = true;
      numfile >> number;
   }

//  print message telling whether number was found
   if (found == true)
      cout << "Your number (" << searchnum << ") was found in the file\n";
   else
      cout << "Your number (" << searchnum << ") was not found in the file\n";
}

Sample Execution: Contents of numbers.dat

33
55
99
11
88
-12
44
22
77
5
66

Sample Execution: Output

Enter the number to search for: 99
Your number (99) was found in the file

Sample Execution: Output

Enter the number to search for: 125
Your number (125) was not found in the file

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© Copyright Emmi Schatz 2002