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  1. // Torrez, Elaine                       CS1A                         Chapter 8 P. 487, #1
  2. /********************************************************************************************
  3.  * 
  4.  * VALIDATE CHARGE ACCOUNT NUMBER
  5.  * 
  6.  * ------------------------------------------------------------------------------------------
  7.  * This program determines whether a user-entered charge account number is valid.
  8.  * The program stores a fixed list of valid account numbers inside an array and then
  9.  * performs a linear search to check if the user’s number exists in the list.
  10.  * If the number is found, the program reports that the account number is valid;
  11.  * otherwise, it reports that it is invalid.
  12.  *
  13.  * Input validation ensures that the user enters a positive 7-digit number before
  14.  * performing the search.
  15.  * ------------------------------------------------------------------------------------------
  16.  * 
  17.  * INPUT
  18.  *    userNum   : Charge account number entered by the user
  19.  * 
  20.  * OUTPUT
  21.  *    Message stating whether the account number is valid or invalid
  22.  * 
  23.  ********************************************************************************************/
  24.  
  25. #include <iostream>
  26. #include <iomanip>
  27. using namespace std;
  28.  
  29. int main()
  30. {
  31.     const int SIZE = 18;                     // Number of account numbers
  32.     int accounts[SIZE] = {                   // List of valid account numbers
  33.         5658845, 4520125, 7895122, 8777541, 8451277, 1302850,
  34.         8080152, 4562555, 5552012, 5050552, 7825877, 1250255,
  35.         1005231, 6545231, 3852085, 7576651, 7881200, 4581002
  36.     };
  37.  
  38.     int userNum;                             // Number entered by the user
  39.     bool found = false;                      // Indicates if number is in array
  40.  
  41.     // -------------------------------
  42.     // INPUT VALIDATION LOOP
  43.     // -------------------------------
  44.     cout << "Enter a 7-digit charge account number: ";
  45.     cin >> userNum;
  46.  
  47.     while (cin.fail() || userNum < 1000000 || userNum > 9999999)
  48.     {
  49.         cin.clear();                         // Clear input error flag
  50.         cin.ignore(1000, '\n');              // Ignore invalid input
  51.  
  52.         cout << "ERROR: Enter a VALID 7-digit positive number: ";
  53.         cin >> userNum;
  54.     }
  55.  
  56.     // -------------------------------
  57.     // LINEAR SEARCH
  58.     // -------------------------------
  59.     for (int i = 0; i < SIZE; i++)
  60.     {
  61.         if (accounts[i] == userNum)
  62.         {
  63.             found = true;
  64.             break;
  65.         }
  66.     }
  67.  
  68.     cout << endl;
  69.     cout << fixed << setprecision(0);
  70.  
  71.     // -------------------------------
  72.     // OUTPUT RESULTS
  73.     // -------------------------------
  74.     if (found)
  75.         cout << "The account number is VALID." << endl;
  76.     else
  77.         cout << "The account number is INVALID." << endl;
  78.  
  79.     return 0;
  80. }
  81.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
5658845

4520125

7895122

8777541

8451277

1302850

8080152

4562555

5552012

5050552

7825877

1250255

1005231

6545231

3852085

7576651

7881200

4581002
stdout 
Enter a 7-digit charge account number: 
The account number is VALID.
https://ideone.com/RA7W9k
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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