没有输出总和在c＃程序

Question

有人可以请看看这段代码，并帮助我确定为什么我没有输出总和for循环退出时？

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 

/*This program finds 100 3 digit numbers between 100 and 1000, prints the message: "Cha, Cha, Cha!" after every 10th number, and outputs the sum of the numbers */ 

namespace MikeVertreeseRandom 
{ 
    class RandomNumbers //using the random class for number generation 
    { 
     static void Main(string[] args) 
     { 
      Random r = new Random(); 

      int number = 0; //r.Next() finds the next random # bet 100 and 1000 

      int sum = 0; //declaring the variable "numberTotal" for the sum 

      int i = 1;   //i is the index counter 

      for (i = 1; i < 100; i++) //the program will run through 100 iterations 
      { 
       number = r.Next(100, 1000); 

       Console.WriteLine(number); //program prints the next random # 

       sum += number; //need to keep a running sum of the numbers found 

       if ((i % 10) == 0) //every 10th iteration, do something 
       { 

        Console.WriteLine("Cha, Cha, Cha!"); //prints this message every 10th number 
       } 
      } 

      Console.WriteLine("The sum is: []", sum); 
      Console.ReadLine(); 
     } 
    } 
} 

Answer 1

你正在做

Console.WriteLine("The sum is: []", sum); 

而是使用{n}，其中n是格式字符串之后的第n个参数Console.WriteLine，即

Console.WriteLine("The sum is: {0}", sum); 

见here有关格式字符串的详细信息。

Answer 2

在Composite Formatting中需要匹配大括号（“{”和“}”）。