increment

Does this code in C fall into the Undefined Behavior category?

扶醉桌前 提交于 2019-12-01 01:54:38
问题 a is an array, foo is a function, and i is an int . a[++i] = foo(a[i-1], a[i]); Would the code above, have an Undefined Behavior ? The array indices ++i , i-1 and i , are guaranteed to be in the array range. 回答1: The behavior is undefined, but it's not because of the modification of the same object twice between two sequence points but it is UB because the side effect on i is unsequnced relative to the value computation of a[i-1] and a[i] using i . §6.5-p(2): If a side effect on a scalar

How to save excel file with incrementing number?

北城余情 提交于 2019-12-01 01:50:28
I am looking for VBA to add to my macro that will increment the file name if the file name already exists. Current Code: Dim filepath As String Dim filename As String Dim filepatharch As String Dim filedate As String Dim filelist As String 'Grab FROM list number Sheets("TD File").Select Range("G4").Select filelist = ActiveCell.Value 'Grab today's date filedate = Format(Now, "MMDD01.") --------------Currently where the '01' comes from (see below) 'Set where to save and the file naming convention filepath = "\\home\serverfolder\FileDrop\" tdfilename = "TD" & filedate & filelist '& ".txt" 'Set

Why does postfix operator++ have higher precedence than prefix operator++?

本秂侑毒 提交于 2019-11-30 23:02:50
问题 Defined this way, we can do neither ++x++ nor ++x-- . But on the other hand, both (++x)++ and (++x)-- are useful expressions: (++x)++ increments x by two and returns the value "in the middle", while (++x)-- is essentially equivalent to x+1 but completely avoids having to call operator+ , which can be quite useful sometimes. So why is the precedence not defined to have ++x++ automatically expand to (++x)++ rather than ++(x++) ? Is there some hidden meaning to the latter which I don't

Explanation of ++val++ and ++*p++ in C

﹥>﹥吖頭↗ 提交于 2019-11-30 15:32:35
问题 int val = 5; printf("%d",++val++); //gives compilation error : '++' needs l-value int *p = &val; printf("%d",++*p++); //no error Could someone explain these 2 cases? Thanks. 回答1: ++val++ is the same as ++(val++) . Since the result of val++ is not an lvalue, this is illegal. And as Stephen Canon pointed out, if the result of val++ were an lvalue, ++(val++) would be undefined behavior as there is no sequence point between the ++ s. ++*p++ is the same as ++(*(p++)) . Since the result of *(p++)

increment row number when value of field changes in Oracle

亡梦爱人 提交于 2019-11-30 14:02:07
I need help in writing a query in Oracle for the following data. The data is sorted by Person and Day fields. Person Day Flag ------ --- ---- person1 day1 Y person1 day2 Y person1 day3 Y person1 day4 N person1 day5 N person1 day6 Y person1 day7 Y person1 day8 Y I need to have a Group_Number column that gets incremented whenever the Flag value changes. My result should look as below Person Day Flag Group_Number ------ --- ---- ------------ person1 day1 Y 1 person1 day2 Y 1 person1 day3 Y 1 person1 day4 N 2 person1 day5 N 2 person1 day6 Y 3 person1 day7 Y 3 person1 day8 Y 3 I think there is way

Sublime Text 2 increment numbers

我怕爱的太早我们不能终老 提交于 2019-11-30 13:52:56
I have a JSON file that looks like this: "Algeriet" : [ { "name" : "Nyårsdagen", "date" : "2013-01-01", "ID" : "1" }, { "name" : "Mawlid En Nabaoui Echarif", "date" : "2013-01-24", "ID" : "2" }, { "name" : "Första maj", "date" : "2013-05-01", "ID" : "3" }, ... ] Now I would like to begin incrementing the IDs from 0 instead of 1. How can I do this with Sublime Text 2? I have installed the Text Pastry plugin but I'm not sure how to select the IDs in the text so that I can replace these values. Peter Warbo Solved it by doing these steps: Do a find and replace for regex "ID" : "\d+" and replacing

Reliability of atomic counters in DynamoDB

╄→尐↘猪︶ㄣ 提交于 2019-11-30 10:53:48
I was considering to use Amazon DynamoDB in my application, and I have a question regarding its atomic counters reliability. I'm building a distributed application that needs to concurrently , and consistently , increment/decrement a counter stored in a Dynamo's attribute. I was wondering how reliable the Dynamo's atomic counter is in an heavy concurrent environment, where the concurrency level is extremely high (let's say, for example, an average rate of 20k concurrent hits - to get the idea, that would be almost 52 billions increments/decrements per month). The counter should be super

How is that x=20;x= ++x + ++x + x++ ;final value of x in java is 65 [duplicate]

半城伤御伤魂 提交于 2019-11-30 09:55:32
问题 This question already has answers here : How do the post increment (i++) and pre increment (++i) operators work in Java? (14 answers) Closed 2 years ago . How is this possible as post increment operator should increase x to 66? When I did the same for y= ++x + ++x + x++; it gave a value 65 for y and 23 for x. So let me know how is java compilers solving these expression. 回答1: Let Java show you. javap -c MyClass shows you bytecode: public static void main(java.lang.String[]); Code: 0: bipush

Java Incremental operator query (++i and i++) [duplicate]

前提是你 提交于 2019-11-30 09:26:25
This question already has an answer here: Is Java “pass-by-reference” or “pass-by-value”? 84 answers Java is NEVER pass-by-reference, right?…right? [duplicate] 6 answers I have the following code: public class Book { private static int sample1(int i) { return i++; } private static int sample2(int j) { return ++j; } public static void main(String[] arguments){ int i = 0; int j = 0; System.out.println(sample1(i++)); //0 System.out.println(sample1(++i)); //1 System.out.println(sample2(j++));//1 System.out.println(sample2(++j));//2 System.out.println(i);//2 System.out.println(j);//2 } } My

Increment value of textinput with jquery like spinner

点点圈 提交于 2019-11-30 07:56:31
Trying to create a simple spinner effect with Jquery, i.e. two buttons (up & down) with a text field. The upbutton increases the value while the down button decreses the value. increment steps + or - 1. Any suggestions as ui.spinner is most def. not working and I am new to jquery. musty be something like $(#up).click (function ( /*SOMETHING GOES IN HERE but what?*/ )) and likewise for #down. both to set adjust the input text field say id #test as above. Maybe something like: $(document).ready( function() { var el = $('#test'); function change( amt ) { el.val( parseInt( el.val(), 10 ) + amt );