prompt | 易学教程

Dynamically prompt for string without knowing string size

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问题 In C, what is the best way of prompting and storing a string without wasted space if we cannot prompt for the string length. For example, normally I would do something like the following... char fname[30]; char lname[30]; printf("Type first name:\n"); scanf("%s", fname); printf("Type last name:\n"); scanf("%s", lname); printf("Your name is: %s %s\n", fname, lname); However, I'm annoyed with the fact that I have to use more space than needed so I do not want to use char fname[30] , but instead

Showing git branch in shell prompt?

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问题 I am trying to get my shell prompt to display the current git branch name. I have read a few tutorials and blog posts etc. and as far as I understand I'm doing everything correctly but it doesn't seem to be working. I would like the prompt to look like this: dannys-macbook:hillcrest-store [master]$ but currently it looks like this: dannys-macbook:hillcrest-store danny$ I have added the following to ~/.bash_profile: PATH=$PATH:/usr/local/bin; export PATH COLOR1="\[\e[1;32m\]" COLOR2='\[\e[1;1m

jni详解（摘自《jni详解》）

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本书涵盖了 Java Native Interface(JNI)的内容，将探讨以下问题： • 在一个 Java 项目中集成一个 C/C++库 • 在一个用 C/C++开发的项目中，嵌入 JavaVM • 实现 Java VM • 语言互操作性问题，特别是互操作过程中的垃圾回收(GC, garbage collection)和并发编程(multithreading) 译注： JNI(Java Native Interface)是 SUN 定义的一套标准接口，如 Dalvik, Apache Harmony 项目...等 Java 虚拟机，都会实现 JNI 接口，供本地(C/C++)应用与 Java VM 互调。 JNI: 可以供 Java 代码调用本地代码，本地代码也可以调用 Java 代码，即上文列出的第 4 条内容：语言互操作；所以，这是一套完善而功能强大的接口。可能有朋友听说过 KNI，那是 J2ME VM(CLDC)中定义的一套东西，不如 JNI 强大。此外，因为 C/C++在系统编程领域的地位，只要打通了与 C/C++的接口，就等于是天堑变通途。首先，通过本书，你会很容易的掌握 JNI 开发，并能了解到方方面面的关于 JNI 的知识。本书详尽的叙述，会带给你你很多如何高效使用 JNI 的启示。JNI 自 1997 年初发布以来， Sun 的工程师们和 Java

Flex 4 Drop Down List - bound with data service, how to always keep prompt or add item at index -1 programmatically

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问题 I have a drop down list that is bound using an HTTP data service from a database (set up through the wizard, not as a declaration). My drop down list changes the values in my datagrid and I need that "Select One" null value so that users can select everything. Here is my drop down list: <s:DropDownList id="ddlProducts" width="400" prompt="Select a Product" close="dataGridContentChanging()" creationComplete="ddlProducts_creationCompleteHandler(event)" labelField="Title"> <s:dataProvider> <s

How to add a date or timestamp to the Matlab prompt? [duplicate]

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问题 This question already has an answer here : Can I change the prompt in MATLAB? (1 answer) Closed last year . This question has been marked as a duplicate of another question asking about the possibility of displaying the current system hostname in the prompt. The accepted answer to that question successfully uses the same custom prompt, called setPrompt(), as does the accepted answer to this question (see below). Please note however: that question does not talk about date/timestamps, nor does

Equivalent of Alert() and Prompt() in PHP

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问题 In JavaScript, we have Alert() and Prompt() which open up a popup box for the user. Is there an equivalent for PHP? $Get_['asdf'] is one way to get user input... any others? Also, one more question. Is it a requirement that PHP always be executed all at once? Or can it be like JavaScript, where it waits for the user input (e.g. popup box), then executes the rest of the code after that. 回答1: PHP is a server side language, it can't do alert messages on the client side. But you can use

Returning from the '+' to '>' prompt in command line of R Studio

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问题 I know the prompt changes from < to + when the command line in R expects you to complete the current command. Is there a way (say, shortcut key) to immediately terminate the command being written and revert from the '+' mode to the regular console '>'? 回答1: Press 'Esc' key will bring you back to the prompt (<). You don't need to type word 'Esc'. 来源： https://stackoverflow.com/questions/22057350/returning-from-the-to-prompt-in-command-line-of-r-studio

To have extra info at a prompt for Git by Zsh

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问题 Torvalds seems to have the following prompt. [torvalds@g5 git]$ The first word is username. g5 seems to be a branch in Git repo, while git shows that it is a branch in Git. My current prompt PROMPT="$" How can you have a similar prompt as Torvalds'? 回答1: Actually, I'm guessing that g5 refers to the hostname of the machine he is currently working on, and git is the current working directory. The format [user@hostname dir]$ is a pretty standard (i.e., widely-used) shell prompt. 回答2: Git's

Customizing PowerShell Prompt - Equivalent to CMD's $M$P$_$+$G?

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问题 I've started to "play around" with PowerShell and am trying to get it to "behave". One of the things I'd like to do is to customize the PROMPT to be "similar" to what "$M$P$_$+$G" do on MS-Dos: A quick rundown of what these do: Character | Description $m The remote name associated with the current drive letter or the empty string if current drive is not a network drive. $p Current drive and path $_ ENTER-LINEFEED $+ Zero or more plus sign (+) characters depending upon the depth of the pushd

replace prompt with UI dialog

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问题 How can I replace the prompt in this code with a simple UI dialog to achieve the same thing. IE is warning about security when using prompt. HTML: <input type="text" id="txt1" name="textbox1"> <input type="button" id="btn" name="buttonExecute" value="Enter number"> JavaScript: $('#btn').click(function() { var n = prompt('Please enter number'); if ( n!=null && n!="" ) { var fixed=n.substr(1,9); $('#txt1').val(fixed); } }); 回答1: Use jQuery UI. See a simple demo here. http://jsfiddle.net/5yhmb