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This strategy doesn't quite work, for two reasons The first reason is that we haven't defined hw our caller defined it for us Because we didn't define it, we don't know what data might be there already For all we know, our caller might be using our function to process homework for lots of students, in which case hw might contain the previous student's grades We can solve this problem by calling hwclear() before we begin our work The second reason that our strategy fails is that we don't quite know when to stop We can keep reading grades until we can no longer do so, but at that point we have a problem There are two reasons why we might no longer be able to read a grade: We might have reached end-of-file, or we might have encountered something that is not a grade In the first case, our caller will think that we have reached end-of-file This thought will be true but misleading, because the end-of-file indication will have occurred only after we have successfully read all the data Normally, an end-of-file indication means that an input attempt failed In the second case, when we have encountered something that isn't a grade, the library will mark the input stream as being in failure state, which means that future input requests will fail, just as if we had reached end-of file Therefore, our caller will think that something is wrong with the input data, when the only problem was that the last homework grade was followed by something that was not a homework grade In either case, then, we would like to pretend that we never saw whatever followed the last homework grade Such pretense turns out to be easy: If we reached end-of-file, there was no additional input to read; if we encountered something that wasn't a grade, the library will have left it unread for the next input attempt Therefore, all we must do is tell the library to disregard whatever condition caused the input attempt to fail, be it end-of-file or invalid input We do so by calling inclear() to reset the error state inside in, which tells the library that input can continue despite the failure There is one more detail to consider: Perhaps we have already encountered an error condition, before even trying to read the that case, we must leave the input stream strictly alone, lest our caller into trying to read nonexistent input at some point Here is the complete read_hw function: // read homework grades from an input stream into a vector<double> istream& read_hw(istream& in, vector<double>& hw) { if (in) { // get rid of previous contents hwclear() ; // read homework grades double x; while (in >> x) hwpush_back(x); // clear the stream so that input will work for the next student inclear(); } return in; } run out of input, or first homework grade In we inadvertently seduce in the future.

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