03-11-2011
It sounds like the same or similar problem as scanf() in C: It throws up on bad data but doesn't actually
discard the bad data.
In C the usual approach is to read strings line-by-line with fgets or getline (fgets preferred because there's some
very broken getline implementations out there), then feed the line into
sscanf. Whether sscanf succeeds or not, the data is out of the input stream and out of your way.
C++ doesn't have special string-only functions, it uses
stringstream to make a string act like
ss>>var>>var; instead. Whether reading your vars from the string succeeds or not, the data is out of cin and can't come back to haunt you.
Here's an example.
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GETS(3) Library Functions Manual GETS(3)
NAME
gets, fgets - get a string from a stream
SYNOPSIS
#include <stdio.h>
char *gets(char *s)
char *fgets(char *s, int n, FILE *stream)
DESCRIPTION
Gets reads a string into s from the standard input stream stdin. The string is terminated by a newline character, which is replaced in s
by a null character. Gets returns its argument.
Fgets reads n-1 characters, or up through a newline character, whichever comes first, from the stream into the string s. The last charac-
ter read into s is followed by a null character. Fgets returns its first argument.
SEE ALSO
puts(3), getc(3), scanf(3), fread(3), ferror(3).
DIAGNOSTICS
Gets and fgets return the constant pointer NULL upon end of file or error.
BUGS
Gets deletes a newline, fgets keeps it, all in the name of backward compatibility.
Gets is not present in the Minix-vmd C library for reasons that should be obvious. Use fgets instead.
7th Edition May 15, 1985 GETS(3)