CODEWITHSUNDEEP
c++
Sanka Darshana
Sanka Darshana

Reputation: 1421

Cannot read from file

I'm having a problem reading an integer from a file. As for my knowledge it should work. Can you tell me what have I done wrong here?

    int fileCount = 0;
    ifstream listFileStream ( fileName );

    if ( listFileStream.is_open() ) {

            listFileStream >> fileCount;
            cout << fileCount;

    }

It only prints 0 even though the first line of the file is 28.

Upvotes: 0

Views: 101

Answers (1)

Dietmar K&#252;hl
Dietmar K&#252;hl

Reputation: 154015

You should always check that you read attempt was successful:

if (listFileStream >> fileCount) {
    process(fileCount);
}

If the read isn't successful you can try to recover from it or report an error. Here is one way you might try to recover: restore the stream to good state and ignore the first character:

listFileStream.clear();
listFileStream.ignore();

Without restoring the stream to a good state all input attempts would be ignored. Once the offending character is removed you would retry the read.

Upvotes: 2

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