How to solve “Unresolved inclusion: ” in a C++ file in Eclipse CDT?
I download eclipse for c++ (cdt-master-8.0.2.zip). When I write: It marks: How can I fix it?
iostream
How to solve “Unresolved inclusion:
operator << must take exactly one argument
The problem is that you define it inside the class, which a) means the second argument is implicit (this) and b) it will not do what you want it do, namely extend std::ostream. You have to define it as a free function:
What’s the difference between while(cin) and while(cin >> num)
Let’s look at these independently: This loop, intuitively, means “keep reading values from cin into x, and as long as a value can be read, continue looping.” As soon as a value is read that isn’t an int, or as soon as cin is closed, the loop terminates. This means the loop will only execute … Read more
Xcode 11.1: iostream’ file not found
I’m compiling from the command line, and none of the answers listed here (or elsewhere) worked for me. What does seem to work (so far) is to add the following to .profile or whatever script your terminal uses to start up: (zsh, csh, bash, etc.) You will probably have to change MacOSX10.15.sdk whenever you upgrade … Read more
How to print (using cout) a number in binary form?
The easiest way is probably to create an std::bitset representing the value, then stream that to cout.
The difference between cin.ignore and cin.sync
cin.ignore discards characters, up to the number specified, or until the delimiter is reached (if included). If you call it with no arguments, it discards one character from the input buffer. For example, cin.ignore (80, ‘\n’) would ignore either 80 characters, or as many as it finds until it hits a newline. cin.sync discards all … Read more
cin.eof() functionality
I understand that cin.eof() tests the stream format. And while giving input, end of character is not reached when there is wrong in the input. I tested this on my MSV C++ 2010 and am not understanding the strange results. No matter what I give the input, I am getting Format Error message that is … Read more
Reading from text file until EOF repeats last line
Just follow closely the chain of events. Grab 10 Grab 20 Grab 30 Grab EOF Look at the second-to-last iteration. You grabbed 30, then carried on to check for EOF. You haven’t reached EOF because the EOF mark hasn’t been read yet (“binarically” speaking, its conceptual location is just after the 30 line). Therefore you … Read more
‘printf’ vs. ‘cout’ in C++
What is the difference between printf() and cout in C++?
Why would we call cin.clear() and cin.ignore() after reading input?
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 code is assuming the user will … Read more