increment

问题 Is it possible to do multiple variable increments on the same line in Python? Example: value1, value2, value3 = 0 value4 = 100 value1, value2, value3 += value4 In my real program I have LOTS of variables that are different but must all be added on with a single variable at one point. What I am currently doing that I wanted this to replace: value1 += value4 value2 += value4 value3 += value4 ... value25 += value4 回答1: You can create special function for it: def inc(value, *args): for i in args:

问题 I have the following code written in both C++ and C# int i=0; ++i = 11; After this C# compiler brings an error The left-hand side of an assignment must be a variable, property or indexer But C++ compiler generate this code with no error and I got a result 11 for value of i . What's the reason of this difference? 回答1: The difference is that pre-increment operator is lvalue in C++, and isn't in C#. In C++ ++i returns a reference to the incremented variable. In C# ++i returns the incremented

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I need to implement alphanumeric increment algorithm like AAA001 should become AAA002 AAA999 should become AAB000 and so on. All alphabets are in uppercase and letters are from 0-9. It can contain alphabet or letter at any position in the alphanumeric string. There are some rules

问题 I'm trying to make my program display (testing in console first) the count number at each step where the cell changes its form. So the count should start from 0 and increment each time the cell changes its form. I tried this, using count++ however it doesn't increment by 1 but instead gives me random numbers. Any help will be much appreciated. import java.awt.Color; import java.util.Timer; import java.util.TimerTask; import java.awt.Image; import java.awt.Graphics; import javax.swing

问题 I'm wondering why in C# the following is fine: int y = x++-+-++x; But int y = x+++-+++x; Isn't? Why is there a bias against the +? 回答1: The other two answers are correct; I will add to them that this illustrates some basic principles of lexical analysis: The lexical analyzer is short-sighted -- it has minimal "look-ahead" The lexical analyzer is greedy -- it tries to make the longest token it can right now . The lexical analyzer does not backtrack trying to find alternate solutions when one

问题 Could somebody explain why the following functions give different results. The first does not seem to work, but the second does. I'm puzzled because I thought +=1 and ++ did the same thing. (I'm not intending to actually use this code, it's just to demonstrate the difference). /*function 1*/ function incrementIfZero1(base,element) { if (element == 0) { return base++; } else { return base; } }; /*function 2*/ function incrementIfZero2(base,element) { if (element == 0) { return base+=1; } else

问题 This is a question about incrementing one value of a MATLAB array multiple times in the same statement, without having to use a for loop. I set my array as: >> A = [10 20 30]; And then run: >> A([1, 1]) = A([1, 1]) + [20 3] A = 13 20 30 Clearly the 20 is ignored. However, i would like it to be included, so that: >> A = [10 20 30]; >> A([1, 1]) = A([1, 1]) + [20, 3] would give: A = 33 20 30 Is there a function to allow this to be done in a nice, vectorised fashion? (In reality, the indexing to

问题 I'd like to substitute some text with an incremental value. Considering file xx: <outro>dfdfd</outro> <RecordID>1</RecordID> <outro>dfdfd</outro> <RecordID>1</RecordID> <outro>dfdfd</outro> <RecordID>1</RecordID> <outro>dfdfd</outro> and sed command: for n in seq 3;do sed -e 's/<RecordID>\d/<RecordID>'`echo $n`'/' xx; done the echo $n command does not get incremented. Tryed also: n=1; sed -e 's/<RecordID>/<RecordID>'`echo $n ;let n=$n+1`'/g' xx but with no success. Considering only sed (no

问题 Consider this (exemplary) bash script: #!/bin/bash -e errorExit() { echo "" >&2 echo "ERROR (${var_scriptfilename}):" >&2 echo "An unhandled error occurred." >&2 intentionalExit 1 } intentionalExit () { trap - EXIT # Unregister the EXIT trap exit $1 } trap errorExit EXIT # Trap script errors var_scriptfilename="$(basename "$0")" # ==== START OF TEST ==== var_counter=0 ((var_counter++)) echo "var_counter is $var_counter" >&2 # ===== END OF TEST ===== intentionalExit 0 If I run it in Cygwin's

问题 I am in the very beginnings of teaching myself php. I am giving myself micro projects to push myself. Thus far I have a MYSQL database, created through a php form. One Column is for karma. I have the values of the database table display in an html table, and at the end of each row, I would like a click on a hyperlink, lets say a plus sign, to increase that row's karma level by 1. Then the plus sign would go away. I should that each row has an auto increment integer as a primary key. 回答1: For