input

问题 I am new to Perl and I'm trying to create a simple calculator program, but the rules are different from normal maths. All operations have the same power and the math problem must be solved from left to right. Here is an example: 123 - 10 + 4 * 10 = ((123 - 10) + 4) * 10 = 1170 8 * 7 / 3 + 2 = ((8 * 7) / 3) + 2 = 20.666 So in the first case the user needs to enter one string: 123 - 10 + 4 * 10. How do i approach this task? I'm sorry if it's too much of a general question, but i'm not sure how

问题 This question already has answers here : Validating input using java.util.Scanner [duplicate] (6 answers) Closed 3 years ago . I am trying to accept only three numbers from my input: 1, 2, 3. Any other different than that must be invalid. I have created method but I don't have an idea why it did not working. What must I change? int number; do { System.out.println("Enter 1, 2 or 3"); while (!scanner.hasNextInt()) { System.out.println("Invalid input!"); } number = scanner.nextInt(); } while

问题 This question already has answers here : Validating input using java.util.Scanner [duplicate] (6 answers) Closed 3 years ago . I am trying to accept only three numbers from my input: 1, 2, 3. Any other different than that must be invalid. I have created method but I don't have an idea why it did not working. What must I change? int number; do { System.out.println("Enter 1, 2 or 3"); while (!scanner.hasNextInt()) { System.out.println("Invalid input!"); } number = scanner.nextInt(); } while

问题 So how can I ask the user to provide me with an input file and an output file? I want the content inside the input file provided by the user to print into the output file the user provided. In this case, the user would put in this Enter the input file name: copyFrom.txt Enter the output file name: copyTo.txt inside the input file is just the text "hello world" . Thanks. Please keep it as simple as you can if possible 回答1: If you just want to copy the file, shutil’s copy file does the loop

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . Improve this question How can I best syntax highlight a single text area, with extremely simple highlighting rules? Javascript-based code editors are huge and bloated - I don't want multi-line editing, line numbers, or anything like that. Just something simple that parses inputted

问题 I am designing a program that has to run with the mvn test command and take a user input from the command line. When I run the program with mvn test everything works until Scanner.next() is executed, then the CLI hangs and I have to close the program. my test method public class AppTest { @Test public void shouldAnswerWithTrue() { Scanner sc = new Scanner(System.in); System.out.println("Awaiting input"); String in = sc.next(); System.out.println("TEST!" + in); assertTrue( true ); } } my pom

问题 I am very new to Kivy, and have found an online example for a simple calculator here that I would like to try to modify using the Kivy examples ~/examples/keyboard/main.py. In that example is a numeric keyboard, but I can't seem to figure out how to get it to appear instead of the standard keyboard. Help or suggestions would be greatly appreciated. Here is what I have started with: from kivy.app import App from kivy.lang import Builder from kivy.uix.floatlayout import FloatLayout from kivy

问题 My PC has two devices working like keyboard, the normal keyboard and a HID ( H uman I nterface D evice) input device (it's a remote control). I want separate the input from keyboard and from remote, capturing only the remote control. How can I write a program in C/C++ to do this task? It's not a easy task because this program is operating system dependent. I need it for Windows, but if someone knows how to do it for Linux, I would appreciate that too. 回答1: On Windows XP and later you can use

问题 How do I read from stdin with monkeyrunner? I tried the following code. import sys print("type something") something = sys.stdin.readline() print(something) I also tried the following: print("type something") something = raw_input() print(something) In both cases the program prints "type something" but it does not respond after I type something. It seems i am making some silly mistake? 回答1: This seems to be a bug with Jython 2.5.3, the version that is included with MonkeyRunner. The issue

问题 For a number input, is there a way to have step=1 yet allow the user to enter decimal numbers? The reason is I want the arrows on the input box to increase/decrease the value by 1, but allow the user to enter decimals if they want to be more specific. At the moment I have: <input type="number" name="price" placeholder="£" step="1" id="id_price"> The arrows work as intended, but I get a validation error if 2.99 is entered, for example. Removing the step allows decimals to be entered, but the