scanf.3s (2010 09)

scanf(3S) scanf(3S)

int i, n1, n2, n3, n4;

n1=n2=n3=n4=-1;

scanf("%nBEGIN%n %d %nEND%n", &n1, &n2, &i, &n3, &n4);

if (n2 - n1 == 5) puts( "matched BEGIN");

if (n4 - n3 == 3) puts( "matched END");

Here is an example that checks the success of suppressed assignments:

int i, n1, n2;

n1=n2=-1;

scanf( "%d %n%*s%n", &i, &n1, &n2);

if (n2 > n1)

printf("successful assignment suppression of %d chars\n", n2-n1);

APPLICATION USAGE

After

scanf() or fscanf() is applied to a stream, the stream becomes byte-oriented (see orienta-

tion (5)).

WARNINGS

Trailing white space (including a newline) is left unread unless matched in the control string.

Truncation of multi-byte characters may occur if a ﬁeld width is used with the conversion character.

AUTHOR

scanf() was developed by AT&T and HP.