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shell - How can I compare numbers in Bash?

I'm unable to get numeric comparisons working: echo "enter two numbers"; read a b; echo "a=$a"; echo "b=$b ... the numbers into a type to do a true comparison? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How to fix 'sudo: no tty present and no askpass program specified' error?

I am trying to compile some sources using a makefile. In the makefile there is a bunch of commands that need to ... to do that. Is there any other solution? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to use GROUP BY to concatenate strings in MySQL?

Basically the question is how to get from this: foo_id foo_name 1 A 1 B 2 C to this: foo_id foo_name 1 A B 2 C Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I restrict a float value to only two places after the decimal point in C?

How can I round a float value (such as 37.777779) to two decimal places (37.78) in C? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Aggregation in Pandas

How can I perform aggregation with Pandas? No DataFrame after aggregation! What happened? How can I aggregate mainly ... groupby, so please read that as well! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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arrays - PHP syntax for dereferencing function result

Background In every other programming language I use on a regular basis, it is simple to operate on the return value of a ... // print $vtemp->{0}; // <- nope Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - lambda in for loop only takes last value

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Something seems wrong with the layout, JButton showing unexpected behaviour at resize of the window

JRE Version 1.7 Update 3 EXPECTED BEHAVIOUR As I run the program, it works as expected, everything works smoothly. As ... ballDiameter); } } **LATEST EDIT : ** Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - How to install Google Play Services in a Genymotion VM (with no drag and drop support)?

How can I install Google Play Services in a Genymotion emulator with no drag and drop support? I can't ... emulators, but it doesn't support tablet emulators. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Multiple GitHub Accounts & SSH Config

I'm having some trouble getting two different SSH keys/GitHub accounts to play well together ... [email protected]:anotheraccount should use id_rsa_anotheraccount. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Android Gallery on Android 4.4 (KitKat) returns different URI for Intent.ACTION_GET_CONTENT

Before KitKat (or before the new Gallery) the Intent.ACTION_GET_CONTENT returned a URI like this content://media/external ... /image:3951 How do I handle this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What is related_name used for?

What is the related_name argument useful for on ManyToManyField and ForeignKey fields? For example, given the following ... 'maps', verbose_name=_('members')) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Get cookie by name

I have a getter to get the value from a cookie. Now I have 2 cookies by the name shares= and by the name obligations= . I ... ], tmp[1], tmp[2], tmp[3]); } } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to find the operating system details using JavaScript?

How can I find the OS name and OS version using JavaScript? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql order by - SQL multiple column ordering

How can I sort by multiple columns in SQL and in different directions. column1 would be sorted descending, and column2 ascending. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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190 views

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How to implement a single instance Java application?

Sometime I see many application such as msn, windows media player etc that are single instance applications (when user ... t know how to do this in Java. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I trigger a JavaScript event click

I have a hyperlink in my page. I am trying to automate a number of clicks on the hyperlink for ... looking for onClick event trigger from the JavaScript. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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295 views

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excel - How can I find last row that contains data in a specific column?

How can I find the last row that contains data in a specific column and on a specific sheet? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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218 views

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oop - Why doesn't Rust support trait object upcasting?

Given this code: trait Base { fn a(&self); fn b(&self); fn c(&self); fn d(&self); } trait Derived ... the LSP? Does anyone know the rationale for such design? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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how to add blank page in digitally signed pdf using java?

I want to insert blank page at end of the digitally PDF using itext library.and my confusion is adding pages will invalidate the existing signatures? Thank you. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do you check if a variable is an array in JavaScript?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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275 views

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angular - *ngIf and *ngFor on same element causing error

I'm having a problem with trying to use Angular's *ngFor and *ngIf on the same element. When trying to loop ... Am I doing something wrong or is this a bug? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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756 views

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module - How to deal with cyclic dependencies in Node.js

I've been working with nodejs lately and still getting to grips with the module system so apologies if this ... a better way to share variables between modules? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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181 views

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Can Mysql Split a column?

I have a column that has comma separated data: 1,2,3 3,2,1 4,5,6 5,5,5 I'm trying to run a ... way to do this so mysql does that processing work. Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Finding the variable name passed to a function

Let me use the following example to explain my question: public string ExampleFunction(string Variable) { return something; } ... ) Is there any way to do this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why is there a default instance of every form in VB.Net but not in C#?

I'm just curious to know that there is the (Name) property, which represents the name of the Form class. This ... why can't C# have an equivalent of this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the difference between 'typedef' and 'using' in C++11?

I know that in C++11 we can now use using to write type alias, like typedefs: typedef int MyInt; Is, ... it generate a new type? Are there any differences? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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106 views

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Generate a Hash from string in Javascript

I need to convert strings to some form of hash. Is this possible in JavaScript? I'm not utilizing a server-side language so I can't do it that way. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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