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Bookmark or Share- C++ putback() member function - Stack Overflowputback puts its parameter back into the input stream, making it the next character to be read. To see it at work, change your loop to the following and watch the program enter an endless loop: To see it at work, change your loop to the following and watch the program enter an endless loop:
- c++ - Difference between putback() and unget() - Stack OverflowIt "ungets" the last-read character. You can lie with putback(c). You can "putback" some character other than the last-read character. Sometimes putting back a character other than the last-read character can be useful. Also, if the underlying read buffer really does have buffering capability, you can "putback" more than one character.
- Calling putback () on istream multiple times - Stack OverflowMany sites describe the istream::putback() function that lets you "put back" a character into the input stream so you can read it again in a subsequent reading operation. What's to stop me, however, from calling putback() multiple times in sequence over the same stream? Of course, you're supposed to check for errors after every operation in ...
- c++ - Injecting string to 'cin' - Stack Overflowcin.putback() is guaranteed to work with at most one character, so you can't putback a whole string. Use a stream that wraps cin and allows arbitrary putback() sequence length. I think Boost.Iostream have something similar, and if it doesn't then it might be helpful to implement such a wrapper.
- c++ - peek multiple chars from cin with putback - Stack Overflowputback calls sputback which only works if a putback position is available. Nothing guarantees that there is an indefinite number of such positions. Nothing guarantees that there is an indefinite number of such positions.
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