cout << “Enter the number: “; int number; cin >> number; cin.ignore(256, ‘\n’); // remaining input characters up to the next newline character // are ignored cout << “Enter names: “; string names; getline(cin, names);
If you’re using getline after cin >> something, you need to flush the newline out of the buffer in between. My personal favourite for this if no characters past the newline are needed is cin.sync(). However, it is implementation defined, so it might not work the same way as it does for me. For something … Read more
It is possible to change the inter-word delimiter for cin or any other std::istream, using std::ios_base::imbue to add a custom ctype facet. If you are reading a file in the style of /etc/passwd, the following program will read each :-delimited word separately. #include <locale> #include <iostream> struct colon_is_space : std::ctype<char> { colon_is_space() : std::ctype<char>(get_table()) {} … Read more
From this reference: If extraction fails (e.g. if a letter was entered where a digit is expected), value is left unmodified and failbit is set (until C++11) If extraction fails, zero is written to value and failbit is set. If extraction results in the value too large or too small to fit in value, std::numeric_limits::max() … Read more
cin is an object of class istream that represents the standard input stream. It corresponds to the cstdio stream stdin. The operator >>overload for streams return a reference to the same stream. The stream itself can be evaluated in a boolean condition to true or false through a conversion operator. cin provides formatted stream extraction. … Read more
As is, you’re only reading in a single integer and pushing it into your vector. Since you probably want to store several integers, you need a loop. E.g., replace cin >> input; V.push_back(input); with while (cin >> input) V.push_back(input); What this does is continually pull in ints from cin for as long as there is … Read more
Define the macro NOMINMAX: This will suppress the min and max definitions in Windef.h.
ignore does exactly what the name implies. It doesn’t “throw away” something you don’t need. Instead, it ignores the number of characters you specify when you call it, up to the char you specify as a delimiter. It works with both input and output buffers. Essentially, for std::cin statements you use ignore before you do … Read more
The cin.clear() clears the error flag on cin (so that future I/O operations will work correctly), and then cin.ignore(10000, ‘\n’) skips to the next newline (to ignore anything else on the same line as the non-number so that it does not cause another parse failure). It will only skip up to 10000 characters, so the … Read more
I would prefer the C++ size constraints over the C versions: // Ignore to the end of Stream std::cin.ignore(std::numeric_limits<std::streamsize>::max()) // Ignore to the end of line std::cin.ignore(std::numeric_limits<std::streamsize>::max(), ‘\n’)