What are the rules of the std::cin object in C++?

What is happening here is that std::cin >> firstName; only reads up to but not including the first whitespace character, which includes the newline (or ‘\n’) when you press enter, so when it gets to getline(std::cin, articleTitle);, ‘\n’ is still the next character in std::cin, and getline() returns immediately. Adding ‘std::cin >> std::ws‘ (ws meaning … Read more

What is a classpath and how do I set it?

When programming in Java, you make other classes available to the class you are writing by putting something like this at the top of your source file: Or sometimes you ‘bulk import’ stuff by saying: So later in your program when you say: The Java Virtual Machine will know where to find your compiled class. … Read more

Regex: ignore case sensitivity

Assuming you want the whole regex to ignore case, you should look for the i flag. Nearly all regex engines support it: Check the documentation for your language/platform/tool to find how the matching modes are specified. If you want only part of the regex to be case insensitive (as my original answer presumed), then you … Read more

‘foo’ was not declared in this scope c++

In C++ you are supposed to declare functions before you can use them. In your code integrate is not declared before the point of the first call to integrate. The same applies to sum. Hence the error. Either reorder your definitions so that function definition precedes the first call to that function, or introduce a … Read more

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