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Join Date: Sep 2007
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Newbie Poster
Hello,
Is there any way of reading words from a string containg a few words separated by white spaces using a loop? I don't know how many argumets the user will input. I wanted to do it like this:
But this keeps reading in the first word from the string.
Is there any way of reading words from a string containg a few words separated by white spaces using a loop? I don't know how many argumets the user will input. I wanted to do it like this:
for(i=0;i<wordCounter;i++)
{
sscanf(input,"%s",argument[i]);
}But this keeps reading in the first word from the string.
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Join Date: Sep 2004
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You can use the %n conversion specifier to find out how many characters were read and adjust the source string accordingly:
Note that the usual guideline of using the number of conversion specifiers to determine what value scanf should return doesn't apply here. %n doesn't add to the number of conversions, which is why the loop uses 1 instead of 2 to mark success.
#include <stdio.h>
int main( void )
{
const char *src = "this is a test";
char word[5];
int n;
while ( sscanf ( src, "%4s%n", word, &n ) == 1 ) {
puts ( word );
src += n;
}
return 0;
} Last edited by Narue : Oct 16th, 2007 at 4:03 pm.
Member of: Beautiful Code Club.
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Newbie Poster
Sorry, but I don't understand this code 
Why do you have to use puts(word) after reading in to word with sscanf? And what does += do?
Why do you have to use puts(word) after reading in to word with sscanf? And what does += do? •
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Join Date: Sep 2004
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>Sorry, but I don't understand this code
Gone are the days when rookies would take a new piece of code and run off to dissect it.
>Why do you have to use puts(word) after reading in to word with sscanf?
Because it's generally a better example if you can see that it's working.
>And what does += do?
It does exactly what your book on C tells you it does: adds the value on the right to the value on the left.
Gone are the days when rookies would take a new piece of code and run off to dissect it.
>Why do you have to use puts(word) after reading in to word with sscanf?
Because it's generally a better example if you can see that it's working.
>And what does += do?
It does exactly what your book on C tells you it does: adds the value on the right to the value on the left.
Member of: Beautiful Code Club.
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Newbie Poster
Yes, I did try it and all I got was a compiler error. It doesn't like src += n;
error: invalid operands to binary +
error: invalid operands to binary +
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>Yes, I did try it and all I got was a compiler error.
Post the exact code you tried then, because you messed it up somehow. Also mention which compiler and OS you're using.
Post the exact code you tried then, because you messed it up somehow. Also mention which compiler and OS you're using.
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Sounds like bad copying on your part, replacing a pointer with an array.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
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