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Join Date: Sep 2007
Posts: 21
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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
Posts: 6,515
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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 5:03 pm.
I'm here to prove you wrong.
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Join Date: Sep 2007
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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
Posts: 6,515
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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.
I'm here to prove you wrong.
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Join Date: Sep 2007
Posts: 21
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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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