I know one should not use global variables but I have a need for them. I have read that any variable declared outside a function is a global variable. I have done so, but in another *.cpp file, that variable could not be found. So it was not really global. Isn’t it so that one has to … Read more
How do I create a regular expression to match a word at the beginning of a string. We are looking to match stop at the beginning of a string and anything can follow it. For example the expression should match: Thanks.
JavaScript has no associative arrays, just objects. Even JavaScript arrays are basically just objects, just with the special thing that the property names are numbers (0,1,…). So look at your code first: It’s important to understand that myArray[‘a’] = 200; is identical to myArray.a = 200;! So to start with what you want: You can’t create a JavaScript array and … Read more
For me this error appeared immediatey after I changed the user’s home directory by It can also happen because of lack of proper permission to authorized_key file in ~/.ssh. Make sure the permission of this file is 0600 and permission of ~/.ssh is 700.
If you only want one item’s count, use the count method: Important Note regarding count performance Don’t use this if you want to count multiple items. Calling count in a loop requires a separate pass over the list for every count call, which can be catastrophic for performance. If you want to count all items, or even just multiple items, use Counter, … Read more
this turns the recursion in to a loop:
Variables declared inside the class definition, but not inside a method are class or static variables: As @millerdev points out, this creates a class-level i variable, but this is distinct from any instance-level i variable, so you could have This is different from C++ and Java, but not so different from C#, where a static member can’t be accessed using … Read more
Using Javascript Disabling a html buttondocument.getElementById(“Button”).disabled = true; Enabling a html buttondocument.getElementById(“Button”).disabled = false; Demo Here Using jQuery All versions of jQuery prior to 1.6 Disabling a html button$(‘#Button’).attr(‘disabled’,’disabled’); Enabling a html button$(‘#Button’).removeAttr(‘disabled’); Demo Here All versions of jQuery after 1.6 Disabling a html button$(‘#Button’).prop(‘disabled’, true); Enabling a html button$(‘#Button’).prop(‘disabled’, false); Demo Here P.S. Updated … Read more
Each type of integer has a different range of storage capacity As stated by James Sutherland in his answer: int and Int32 are indeed synonymous; int will be a little more familiar looking, Int32 makes the 32-bitness more explicit to those reading your code. I would be inclined to use int where I just need ‘an integer’, Int32 where the size is important (cryptographic code, … Read more
Concurrency is when two or more tasks can start, run, and complete in overlapping time periods. It doesn’t necessarily mean they’ll ever both be running at the same instant. For example, multitasking on a single-core machine. Parallelism is when tasks literally run at the same time, e.g., on a multicore processor. Quoting Sun’s Multithreaded Programming Guide: Concurrency: A condition that exists when at least two … Read more