sscanf in c - get only specific digit/string

Question

I have the following sscanf:

int four;
sscanf("1234&awe$asdf@3222*gr45", format, four);

I want this sscanf to put the value 3222 in the variable four. What should be the format string?

& $ @ and * always stays the same. So other example of string inputs can be:

"6345&346dfh$aweg@5463*nvm" -> and four will be 5463

"0hjgf&456d$fhg@05645*pogyu" -> and four will be 05645

Im sorry if im not clear enough. Im trying to be as clearest as possible.

Edit: I think that the way is this:

sscanf("1234&awe$asdf@3222*gr45", "@%d*", four);

Any other ways?

AProgrammer · Accepted Answer · 2013-11-16 18:15:35Z

2

Your suggestion won't work, you need first to skip everything to the @, so "%*[^@]@%d"

answered Nov 16, 2013 at 18:15

AProgrammer

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2 Comments

Weiner Nir Over a year ago

Im sorry for beeing noob, But if i want to save the second one as well? What shall I do?

Weiner Nir Over a year ago

Is it something like "%*[^&]&%s%*[^@]@%d"

smac89 · Accepted Answer · 2013-11-16 18:41:10Z

2

#include <cstdio>

int main() {
    int four = 0;
    sscanf("1234&awe$asdf@3222*gr45", "%*[^@]@%d%*s", &four);
    printf("%d\n", four);
    return 0;
}

To get second number, you do:

sscanf("1234&awe$asdf@3222*gr45", "%*[^@]@%d%*[^0-9]%d", &four, &four1);

edited Nov 16, 2013 at 18:41

answered Nov 16, 2013 at 18:31

smac89

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Comments

chux · Accepted Answer · 2013-11-16 19:22:52Z

1

@Nirock comment is on track.

int four;
// Anything not & (don't save it) followed by & then
// Anything not $ (don't save it) followed by $ then
// Anything not @ (don't save it) followed by @ then
// Anything not * (don't save it) followed by * then
// followed by an `int`
if (1 == sscanf(s, "%*[^&]&%*[^$]$%*[^@]@%*[^*]*%d", &four)) {
  ; // found it
}

edited Nov 16, 2013 at 19:22

answered Nov 16, 2013 at 18:54

chux

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2 Comments

Weiner Nir Over a year ago

If i want to do Anything not & or @ (don't save it) Is it simply %*[^&@]?

chux Over a year ago

@Nirock Yes. If you want "Anything not & or @ (don't save it) followed by one & or @ (don't save it)", use "%*[^&@]%*1[&@]". BTW, be careful using the %[], it can be confusing.

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