Recent questions tagged Why

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why in c language EOF IS -1?

in c language i am using EOF .....why EOF IS -1 ? why not other value? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why javascript's charAt() with a string returns the first letter

I am doing some exercises in my object-oriented javascript book, I notice that this: var a = "hello"; a.charAt('e'); // 'h' a.charAt ... this missing bit of information in the question proper Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why cant an Int and a floating point number be added in haskell

why wont this work :- (length [1,2,3,4]) + 3.2 while this works:- 2+3.3 I understand that in the first case the result is an Int+Float but is ... :- Num+Num whereas it does not do that in the first case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why do some lines not have semicolon in C#?

I am just trying to figure out the technical reason why in the below some lines do not end with a semicolon but other lines do - what is it about a semicolon ... filePath); **//NEEDS a semicolon** } } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why enum could not be resolved in JAVA?

I was using J2EE Eclipse Indigo, and I have three class declare like this: public interface ClassA { public static enum TYPE { TYPE1, TYPE2 }; } public ... May I know what cause the error in this code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why is ColdFusion's Epoch Time Dec 30, 1899?

<cfoutput> <cfset x = createTimespan(0,0,0,0)> <cfset epoch = createDateTime(1899,12,30,0,0,0)> <cfset date = epoch + x> #date# #dateFormat(date)# ... 12:00 AM What's so significant about Dec 30, 1899? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why is maximum single-line length limited to 132 characters in Fortran Standard?

Is it about performance, clean source code, compilers, ...? I know that many compilers allow longer single-line codes. But, if this ... eliminates the maximum line length and continuation limits. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why foreach is faster than for loop while reading richtextbox lines

There are two ways to read data from RichTextBox line by line 1 ) use a for loop to loop through lines of a richtextBox String s=String.Empty; for ... second to enumerate it. Why is this behaviour there? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why Javascript SetTimeout() is not multithreaded

I have a test: Html: <div id="f1">Empty</div> <div id="f2">Empty</div> ? js: var s1 = function() { ? ??for (i = 1; i ... why setTimeOut() not run in different threads, instead like event model ? jsfiddle See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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272 views

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why multiple assignments and single assignments behave differently in python

I was working with queue in python when I had a error in code even while the code looked very perfect to me but latter when I changed assignment style all ... y.get(10) why do both code work differently? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why can't I ping the external IP address of my Google Compute Engine instance?

I created a Google Compute Engine instance but can not ping its external IP address (173.255.118.164). I can ssh into the instance via gcutil, but ... and just works. What's up with Google ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why cant I return data from $.post (jquery)

I must be making a silly mistake but I cannot return the data I get from a $.post function and store it in a variable, not only ... wrong or misunderstanding something. Can someone please help. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why am I not able to run batch file in jenkins pipeline running in windows 10?

I'm trying to run a batchscript present inside the workspace of jenkins. I have written a groovy script as below to do this stage('batchscript') ... window opens up. Any suggestion will be helpfull See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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368 views

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why does array slice convert javascript arguments to array

Why does applying the slice method to the javascript arguments value as follows Array.prototype.slice.call(arguments) convert it to an array? If slice ... special case when slice is applied to arguments? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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320 views

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why doesn't this c programme print the first printf statement?

#include<stdio.h> #include <unistd.h> int main(){ while(1) { fprintf(stdout,"hello-out"); fprintf(stderr,"hello-err"); sleep(1); } return 0; ... is that so?Can someone please explain the reason behind it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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372 views

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why doesn't this c programme print the first printf statement?

#include<stdio.h> #include <unistd.h> int main(){ while(1) { fprintf(stdout,"hello-out"); fprintf(stderr,"hello-err"); sleep(1); } return 0; ... is that so?Can someone please explain the reason behind it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why '?' appears as output while Printing unicode characters in java

While printing certain unicode characters in java we get output as '?'. Why is it so and is there any way to print these characters? This is my ... ()); Output is After insertion... unico?decharacter See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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why null==undefined is true in javascript

If we alert(null==undefined) it outputs to true. What is the logical reason for this. Is this something that is hard coded in javascript or is there an explanation for this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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387 views

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why does the redis memory usage not reduce when del half of keys

Redis is used to save data but it costs a lot of memory, and its memory usage up to 52.5%. I deleted half of the keys ... master_last_io_seconds_ago:0 master_sync_in_progress:0 db0:keys=66372158,expires=0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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312 views

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why do we prefer ? to ?? operator in c#?

I recently found that we can use ?? operator to check nulls. Please check the below code samples: var res = data ?? new data(); This is exactly ... from recursive & Anton. Its a mistake in careless. :( See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why --- (3 dashes/hyphen) in yaml file?

So I just started using YAML file instead of application.properties as it is more readable. I see in YAML files they start with ---. I googled ... . Can anyone please explain with a simple example? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why this code works in C

#include <stdio.h> int main(){ char array[2]; array[0] = 'q'; array[1] = 'a'; printf("%s",array); return 0; } if you ask me this ... string. When i execute it, it works perfectly. Can you explain why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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329 views

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why we use <html> tag although my website runs perfect without <html> tag

I need to know what is the use of <html> tag from the beginning of the webpage although website runs perfectly without these <html> </html> tags. I ... is required but why this <html> tag is required. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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332 views

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why the same color looks different on different android devices

I find lots of colors look different on different android devices. For example, if I set #fff8f5ea as the background color of a View and run the app ... body have the same problem? Does anyone know why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

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why my file permission being changed after pull from git repository

I have been came across this problem over and over again. I have a git repository set up on my remote server and all the files are set to ... 0644 to manually changed my files permission back to normal See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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714 views

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why does my x axis ticks are not sorted properly in plotly graph

I am trying to plot a sales trend, over the weeks. But in the x axis, the ticks are not in proper sorted order, there by making my graph look weird. Graph ... 415 EGG MASALA 2020-02-24/2020-03-01 50.04 1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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702 views

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why android gradle maven publish artifact bundleRelease not found

When i sync project, android studio warn could not get unknown property 'bundleRelease' for object of type org.gradle.api.publish.maven.internal.publication. ... What should i do to set the artifact See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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389 views

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why game is running slow in libgdx?

I am making racing game in Libgdx.My game apk size is 9.92 mb and I am using four texture packer of total size is 9.92 Mb. My game is running ... run on android device very slow. What is reason behind it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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