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From: bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: Whaddaya think?
Date: Sun, 16 Jun 2024 00:22:34 +0100
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On 15/06/2024 23:03, Ben Bacarisse wrote:
> DFS <nospam@dfs.com> writes:
> 
>> I want to read numbers in from a file, say:
>>
>> 47 185 99 74 202 118 78 203 264 207 19 17 34 167 148 54 297 271 118 245 294
>> 188 140 134 251 188 236 160 48 189 228 94 74 27 168 275 144 245 178 108 152
>> 197 125 185 63 272 239 60 242 56 4 235 244 144 69 195 32 4 54 79 193 282
>> 173 267 8 40 241 152 285 119 259 136 15 83 21 78 55 259 137 297 15 141 232
>> 259 285 300 153 16 4 207 95 197 188 267 164 195 7 104 47 291
>>
>>
>> This code:
>> 1 opens the file
>> 2 fscanf thru the file to count the number of data points
>> 3 allocate memory
>> 4 rewind and fscanf again to add the data to the int array
>>
>> Any issues with this method?
> 
> There are two issues: (1) you end up with a program that can't be
> "piped" to (because the input can't be rewound), and (2) the file might
> change between counting and reading.

It might change even while you're reading it once.