for-loop

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question I got this question in an interview that what's the impacts of declaring expression sum+=i; or sum = sum+i; inside the loop. int sum = 0; for (int i = 0; i <= 100; i++) { sum = sum + i; //Expression 1 sum += i; //Expression 2 } 回答1: In this example, there is no difference

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question I got this question in an interview that what's the impacts of declaring expression sum+=i; or sum = sum+i; inside the loop. int sum = 0; for (int i = 0; i <= 100; i++) { sum = sum + i; //Expression 1 sum += i; //Expression 2 } 回答1: In this example, there is no difference

问题 This is my current code which shows the servers it is currently in. Which this does what I would like it to do, but it is not efficient and can be avoided instead of sending an embed message for each server it gets. @client.command() @commands.is_owner() async def list_guilds(ctx): servers = client.guilds for guild in servers: embed = discord.Embed(colour=0x7289DA) embed.set_footer(text=f"Guilds requested by {ctx.author}", icon_url=ctx.author.avatar_url) embed.add_field(name=(str(guild.name))

问题 This is my current code which shows the servers it is currently in. Which this does what I would like it to do, but it is not efficient and can be avoided instead of sending an embed message for each server it gets. @client.command() @commands.is_owner() async def list_guilds(ctx): servers = client.guilds for guild in servers: embed = discord.Embed(colour=0x7289DA) embed.set_footer(text=f"Guilds requested by {ctx.author}", icon_url=ctx.author.avatar_url) embed.add_field(name=(str(guild.name))

问题 I'm struggling with a plot I want to make using a for-loop. I know it works when I add it after the loop (just a simple plot). But I want to try it in this other way. fib = ones(1:10); for k=3:10 hold on fib(k) = fib(k-1) + fib(k-2); plot(k,fib(k)) end hold off The output is a plot, but there are no points visible. 回答1: You need to specify a marker. The documentation says: If one of X or Y is a scalar and the other is either a scalar or a vector, then the plot function plots discrete points.

问题 i am getting the error "Cannot convert value of type 'Int' to expected argument type 'Dictionary.Index'" at lines 8 & 9 ("let k" & "for y in") var namesDictionary = [String: [classObject]]() func checkFavoriteCount(table:UITableView) { favArray.removeAll() for x in (0...namesDictionary.keys.count - 1) { let k = namesDictionary[x].key for y in (0...namesDictionary[x].value.count - 1) { if (namesDictionary[k]?[y].isFav ?? false) { favArray.append((namesDictionary[k]?[y])!) } } } tableView

问题 How does a for loop inside for loop works without a curly braces? As you can see there's two for loops inside while loop first too but they require braces but in the main statement in that nested loop no braces are required? I am confused on that can anyone explain that? #include <stdio.h> #include <string.h> #include <math.h> #include <stdlib.h> int main() { int n; scanf("%d", &n); int size=2*n-1; int start=0; int end=size-1; int a[size][size]; while(n != 0) { for(int i=start; i<=end;i++){

问题 I am trying to write a for loop, where I have to increment exponentially. I am using stride function but it won't work. Here's c++ code, I am trying to write a swift version. for (int m = 1; m <= high - low; m = 2*m){} can you help me, to write this code in swift version? 回答1: A while-loop is probably the simplest solution, but here is an alternative: for m in sequence(first: 1, next: { 2 * $0 }).prefix(while: { $0 <= high - low }) { print(m) } sequence() (lazily) generates the sequence 1, 2,

问题 This code will compare usernames and passwords that are stored in a text file. I think it is because of the for loop, it is probably simple but I cant see it. public int loginCheck() { //----------------------------------------------------------------- string[] users = File.ReadLines("Username_Passwords").ToArray(); //line of text file added to array //----------------------------------------------------------------- for (int i = 0; i < users.Length; i++) { string[] usernameAndPassword =

问题 here is my js fiddle : http://jsfiddle.net/pYM38/16/ var box = document.getElementById('box'); var colors = ['purple', 'yellow', 'orange', 'brown', 'black']; box.onclick = function () { for (i = 0; i < colors.length; i++) { box.style.backgroundColor = colors[i]; } }; I'm in the process of learning JavaScript. I was trying to get this to loop through each color in the array, but when i click the box (demonstration on jsfiddle) it goes to the last element in the array. 回答1: Here are two methods