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PORestrict input to 4 digit entry (0-9)
 

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    <p>Homework Assignment #2 for Program Design Class</p> <blockquote> <p>Part 1:</p> <ul> <li>Prompt user for 8 digit account number (0-9), repeat until valid.</li> </ul> <p>Part 2:</p> <ul> <li>Prompt user to set 4 digit pin number (0-9), repeat until valid.</li> <li>Prompt user to verify pin number, return to Part 2 if invalid.</li> </ul> </blockquote> <p>The program works, however, I'd like to validate for some extra things:</p> <ol> <li>Accept leading zeros ex., '00123456' </li> <li>Reject additional letters ex., '12345678a' </li> <li>Reject additional 'words' ex., '12345678 123abc'</li> </ol> <p>I'm thinking, prompt for a string input, check the length of it (4 or 8) and if it passes that test, convert it to an integer and proceed with the tests in place. </p> <p>Any thoughts?</p> <p>[ A lot of you dislike the use of <code>scanf</code>, I know. I'm more interested in how I can make minimal changes to my program instead of reinventing [my] wheel! :) ]</p> <pre><code>#include &lt;stdio.h&gt; int main() { int return_val = 0; int account_number = 0; int pin_number = 0; int pin_number_verify = 0; int valid_pin = 0; // Account # Validation while(1) { printf ("Please enter your 8 digit account number:\n"); return_val = scanf("%d", &amp;account_number); if((account_number &gt; 9999999) &amp;&amp; (account_number &lt; 99999999)) { if (return_val == 1) { break; } } printf("Invalid account number. Account number must be 8 digits.\n\n"); while (getchar() != '\n'); /* Clear keyboard input buffer */ } return_val = 0; // Pin # Validation while(1) { printf ("\nPlease choose a 4 digit pin number:\n"); return_val = scanf("%d", &amp;pin_number); while (getchar() != '\n'); /* Clear keyboard input buffer */ if((pin_number &gt; 999) &amp;&amp; (pin_number &lt; 9999)) { if (return_val == 1) { while(1) { printf("Re-enter pin number:\n"); return_val = scanf("%d", &amp;pin_number_verify); while (getchar() != '\n'); /* Clear keyboard input buffer */ if(pin_number != pin_number_verify) { printf("Pin setup unsuccessful\n\n"); break; } else { valid_pin = 1; break; } } } } if (valid_pin == 1) { break; } printf("Invalid pin number. Pin number must be 4 digits.\n"); while (getchar() != '\n'); /* Clear keyboard input buffer */ } // Successful account setup prompt printf("\nPin setup successful!\n"); printf("Account #: %d\n", account_number); printf("Pin #: %d\n", pin_number); printf("Have a nice day.\n"); return 0; } </code></pre>
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    1. USJesse Walton
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    1. CODoes the program work or not? Have you run test cases to see if the proper things are accepted/rejected?
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      1. USJohn
    2. COYes, it works. It just validates sometimes when it shouldn't and vice versa. Edit: when I say 'shouldn't' I mean based on my desired results.
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      1. USJesse Walton
    3. COUsing `strtol()` might not require much change and would be a lot easier, but you may already know that based on your note above. :)
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      1. USDan Fego
 

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