StackOverflow2013

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plurals

PO
primarykey
Id
16850470
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-05-31T05:40:58.157
FavoriteCount
0
LastActivityDate
2013-05-31T12:43:42.727
LastEditDate
2013-05-31T12:43:42.727
LastEditorUserId
2410359
OwnerUserId
2410359
ParentId
16848822
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
I really don't like using <code>scanf()</code>, prefer <code>fgets()</code>, then <code>sscanf()</code>. Details below. 2 key lines: <pre><code>if (fgets(buf, sizeof(buf), stdin) == NULL) ... while (1 != sscanf(buf, " %8lu %c", &AccontNummner, &ch)); </code></pre> Solution <pre><code>#include <stdio.h> #include <stdlib.h> // Get 8 digit account number. Returns -1 on I/O error or EOF // Parsing error just tries again. long Get8DigitAccountNumber(void) { const char *prompt = "Enter 8 digit account number: "; unsigned long AccontNummner; char ch; // Extra text char buf[1024]; do { // or while (1) ch = '\0'; printf(prompt); fflush(stdout); // Appears to be needed on some systems. prompt = "Error, try again: "; // Used on re-try if (fgets(buf, sizeof(buf), stdin) == NULL) { return -1; // handle I/O error } // If not _exactly_ one 1-8 digit field parsed, then try again. // Leading and trailing whitespaces are OK } while (1 != sscanf(buf, " %8lu %c", &AccontNummner, &ch)); return (long) AccontNummner; } int main() { long AccontNummner; while ((AccontNummner = Get8DigitAccountNumber()) >= 0) { printf("# %lu\n", AccontNummner); } return 0; } </code></pre> If you want to read exactly 8 digits ... <pre><code> int n1 = 0; int n2 = 0; } while ((1 != sscanf(buf, " %n%8lu%n %c", &n1, &AccontNummner, &n2, &ch) || ((n2 - n1) != 8)); </code></pre> <hr> Acceptable format: [optional whitespaces][1-8 digits][optional whitespaces][nothing more] <code>sscanf()</code> format: <code>" %8lu %c"</code>. Use <code>%u</code> instead of <code>%d</code> to not allow <code>'-'</code>. Explicitly allow optional leading and trailing spaces. The <code>%c</code> catches any non-white char after the 8-digit number. Scanning anything via <code>%c</code> causes <code>sscanf()</code> to return 2. 
Tags
Title
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PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PORestrict user input to 8 digit number
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USchux
UserOwnerUserId
1. USchux
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

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