In java you don’t check if a key is pressed, instead you listen to KeyEvents. The right way to achieve your goal is to register a KeyEventDispatcher, and implement it to maintain the state of the desired key: Then you can always use: You can, of course, use same method to implement isPressing(“<some key>”) with … Read more
Use a while loop above input line as: And, use if condition to break. Also, condition for leap year is wrong in your code. It should be: PS: As in comments, I’ll give a complete code:
This has really puzzled me for a while but this is what I found in the end. When you call, sc.close() in first method, it not only closes your scanner but closes your System.in input stream as well. You can verify it by printing its status at very top of the second method as : … Read more
Alright, let’s elaborate with some simplified explanation about the Scanner class. It is a standard Oracle class which you can use by calling the import java.util.Scanner. So let’s make a basic example of the class: Now when you call Scanner input = new Scanner(System.in); you make a new object of the Scanner class (so you make a new “Scanner”) and you store … Read more
num will always contain an integer because it’s an int. The real problem with your code is that you don’t check the scanf return value. scanf returns the number of successfully read items, so in this case it must return 1 for valid values. If not, an invalid integer value was entered and the num … Read more
I believe that should do what you need.
CONIN$ is the console input device. Normally, stdin is an open file handle to this, but if stdin is redirected for some reason, then using CONIN$ will allow you to get access to the console despite the redirection. Reference.
You can use System.in to read from the standard input. It works just like entering it from a keyboard. The OS handles going from file to standard input.
Alright, let’s elaborate with some simplified explanation about the Scanner class. It is a standard Oracle class which you can use by calling the import java.util.Scanner. So let’s make a basic example of the class: Now when you call Scanner input = new Scanner(System.in); you make a new object of the Scanner class (so you make a new “Scanner”) and you store … Read more
It depends on whether you want to do it in a line by line basis or as a full set. For the whole file into a vector of integers: If you want to deal in a line per line basis: