置若惘闻

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;//注意，调试模式
 
namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] testArray ={ 4, 7, 4, 2, 7, 3, 7, 8, 3, 9, 1, 9 };
            int[] maxValIndices;
            int maxVal = Maxima(testArray, out maxValIndices);
            Console.WriteLine("Maximum value {0} found at element indices", maxVal);
            foreach (int index in maxValIndices)  //列出数组中的元素
            {
                Console.WriteLine(index);
            }
            Console.ReadKey();
        }
 
        static int Maxima(int[] integers, out int[] indices)
        {
            Debug.WriteLine("Maximum value search start.");
            indices=new int[1];//数组长度1
            int maxVal=integers[0];
            indices[0]=0;
            int count=1;
            Debug.WriteLine("Maximum value initilized to" + maxVal + ", at element index 0.");
            for (int i=1;i<integers.Length;i++)
            {
                Debug.WriteLine("Now looking at element at index"+i+".");
                if (integers[i]>maxVal)
                {
                    maxVal=integers[i];
                    count=1;
                    indices=new int[1];
                    indices[0]=i;//重新对数组中的元素赋值
                    Debug.WriteLine("New maximum found. New value is "+maxVal+", at element index "+i+".");
                }
                else
                {
                    if (integers[i]==maxVal)
                    {
                        count++;//计数器加1
                        int[] oldIndices=indices;
                        indices=new int[count];//数组长度变化
                        oldIndices.CopyTo(indices,0);//将旧数组中的元素复制进新的数组，位置从0开始
                        indices[count-1]=i;
                        Debug.WriteLine("Duplicate maximum found at element index"+i+".");
                    }
                }
            }
            Trace.WriteLine("Maximum value "+maxVal+" found, with "+count+" occurrences.");
            Debug.WriteLine("Maximum value search completed.");
            return maxVal;
        }
 
    }
}

struct order
        {
            public string itemName;
            public int unitCount;
            public double unitCost;
            public double SumCost()  
            {
                return unitCount * unitCost;
            }
            public string OrderInformation()
            {
                return "Order information: " + unitCount + " " + itemName + " " + "item at $" + unitCost + " each, total cost $" + SumCost();
            }
        }
 
        static void Main(string[] args)
        {
            order bill;
            bill.itemName = "Milk";
            bill.unitCount = 10;
            bill.unitCost = 0.3;
            Console.WriteLine(bill.SumCost());
            Console.WriteLine(bill.OrderInformation());
            Console.ReadKey();
        }

delegate double ProcessDelegate(double param1, double param2);
 
        static double Multiply(double param1, double param2)
        {
            return param1 * param2; //返回乘积
        }
 
        static double Divide(double param1, double param2)
        {
            return param1 / param2; //两数相除
        }
 
 
        static void Main(string[] args)
        {
            ProcessDelegate process;
            Console.WriteLine("Enter 2 numbers separated with a comma:"); //输入两个数字并且以逗号隔开
            string input = Console.ReadLine();
            int commaPos = input.IndexOf(',');//indexof:查找第一次出现逗号的位置;indexof(','2)第二次出现逗号的位置;indexof(',',3,2)从第三开始查，查两位；返回值是绝对位置，为空则为 -1
            double param1 = Convert.ToDouble(input.Substring(0, commaPos));//Substring：截取从0-commaPos（2）的字符串
            double param2 = Convert.ToDouble(input.Substring(commaPos + 1, input.Length - commaPos - 1));
            Console.WriteLine("Enter M to Multiply or D to divide:");
            input = Console.ReadLine();
            if (input == "M")
                process = new ProcessDelegate(Multiply);
            else
                process = new ProcessDelegate(Divide);
            Console.WriteLine("Result: {0}", process(param1, param2));
            Console.ReadKey();
            }

using System;
using System.Collections.Generic;
using System.Text;
 
namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            int var1, var2;
 
            //录入开始
            start:
            Console.WriteLine("Enter a number:");
            var1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter another number");
            var2 = Convert.ToInt32(Console.ReadLine());
            //录入结束
 
            if (var1>10) 
            {
                if (var2 > 10)
                {
                    Console.WriteLine("都超过10，重新输入");
                    goto start;
                }
                else
                {
                    Console.WriteLine("{0}", var1);
                }
            }
            else {
                if (var2>10) {
                    Console.WriteLine("{0}",var2);
                }
                else
                    Console.WriteLine("两数都不超过10");
            }
            Console.ReadKey();
        }
    }
}