user-input | 易学教程

Converting String Array to an Integer Array

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问题 so basically user enters a sequence from an scanner input. 12, 3, 4 , etc. It can be of any length long and it has to be integers. I want to convert the string input to an integer array. so int[0] would be 12 , int[1] would be 3 , etc. Any tips and ideas? I was thinking of implementing if charat(i) == ',' get the previous number(s) and parse them together and apply it to the current available slot in the array. But I'm not quite sure how to code that. 回答1: You could read the entire input line

Stop data inserting into a database twice

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问题 Im quite new to PHP, i was wondering what methods/preventions other programmers use to stop data being entered twice into a MySQL database when a user refreshes on the same page as a form? Obviouly it happens and i need a good way to stop this. Thanks, Ben 回答1: I call this a golden rule of web programming: Never ever respond with a body to a POST-request. Always do the work, and then respond with a Location: header to redirect to the updated page so that browser requests it with GET. This way

How to read an integer input from the user in Rust 1.0?

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问题 Existing answers I\'ve found are all based on from_str (such as Reading in user input from console once efficiently), but apparently from_str(x) has changed into x.parse() in Rust 1.0. As a newbie, it\'s not obvious how the original solution should be adapted taking this change into account. As of Rust 1.0, what is the easiest way to get an integer input from the user? 回答1: Here is a version with all optional type annotations and error handling which may be useful for beginners like me: use

Which is the best way to get input from user in C?

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问题 Many people said that scanf shouldn\'t be used in \"more serious program\", same as with getline . I started to be lost: if every input function I got across people said that I shouldn\'t use any of them, then what should I use? Is there is a more \"standard\" way to get input that I\'m not aware of? 回答1: Generally, fgets() is considered a good option. It reads whole lines into a buffer, and from there you can do what you need. If you want behavior like scanf() , you can pass the strings you

JavaScript: Check if mouse button down?

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Is there a way to detect if a mouse button is currently down in JavaScript? I know about the "mousedown" event, but that's not what I need. Some time AFTER the mouse button is pressed, I want to be able to detect if it is still pressed down. Is this possible? Eugene Lazutkin Regarding Pax' solution: it doesn't work if user clicks more than one button intentionally or accidentally. Don't ask me how I know :-(. The correct code should be like that: var mouseDown = 0; document.body.onmousedown = function() { ++mouseDown; } document.body.onmouseup = function() { --mouseDown; } With the test like

How do I do simple user input in python? [duplicate]

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问题 This question already has an answer here: How can I read inputs as numbers? 10 answers I\'m just playing with input and variables. I\'m trying to run a simple function: slope = (y2-y1)/(x2-x1) I\'d like to prompt the user to enter y2 , y1 , x2 and x1 . What is the simplest, cleanest way to do this? 回答1: You can use the input() function to prompt the user for input, and float to convert the user input from a string to a float: x1 = float(input("x1: ")) y1 = float(input("y1: ")) x2 = float

Commas messing with number input in Javascript

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问题 I have a page with some elements that are controlled by the user. One of these is a text input field, where the user is supposed to input a number. Everything works well if the user only inputs digits (EG 9000), but is the user uses comma notation (the being 9,000) javascript doesn\'t take the input as an integer. How can I remove the commas and/or force the input to an integer? I tried using parseint(), but it doesn\'t seem to work with commas. 回答1: Use a global regular expression to replace

Is it ever useful to use Python's input over raw_input?

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I currently teach first year university students python, and I was surprised to learn that the seemingly innocuous input function, that some of my students had decided to use (and were confused by the odd behaviour), was hiding a call to eval behind it. So my question is, why does the input function call eval , and what would this ever be useful for that it wouldn't be safer to do with raw_input ? I understand that this has been changed in Python 3, but it seems like an unusual design decision in the first place. Python 2.x input function documentation Is it ever useful to use Python 2's input

What does `scanf(“%[^\n]%c”)` mean?

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问题 I want to make a loop in C that, when the program asks for an integer and the user types a non-digit character, the program asks again for an integer. I just found the below code. but I don\'t understand what this means scanf(\"%*[^\\n]%*c\") . What does ^\\n mean? What does the * before ^\\n and c mean? /* This program calculate the mean score of an user 4 individual scores, and outputs the mean and a final grade Input: score1, score2,score2, score3 Output: Mean, FinalGrade */ #include

PHP to clean-up pasted Microsoft input

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问题 I have a site where users can post stuff (as in forums, comments, etc) using a customised implementation of TinyMCE. A lot of them like to copy & paste from Word, which means their input often comes with a plethora of associated MS inline formatting. I can\'t just get rid of <span whatever> as TinyMCE relies on the span tag for some of it\'s formatting, and I can\'t (and don\'t want to) force said users to use TinyMCE\'s \"Paste From Word\" feature (which doesn\'t seem to work that well