循环语句

标签：

for

格式：

  for (int i = 1/*初始条件*/; i <= 100/* 循环条件*/; i++ /*状态改变*/)

  {

  //循环体，执行代码；(break;跳出循环体)

  }

给出初始条件，先判断是否满足循环条件，如果不满足条件则跳过for语句，如果满足则进入for语句执行，for语句内的代码执行完毕后，将按照状态改变，改变变量，然后判断是否符合循环条件，符合则继续执行for语句内的代码，直到变量i不符合循环条件则终止循环，或者碰到break;命令，直接跳出当前的for循环。

break在这里是跳出循环的意思。

for可以嵌套。

例：

一个游戏，前20关是每一关自身的分数，
            21-30关每一关是10分
            31-40关，每一关是20分
            41-49关，每一关是30分
            50关，是100分
            输入你现在闯到的关卡数，求你现在拥有的分数
            两种做法：if嵌套for    for嵌套if

1.if嵌套for

      Console.WriteLine("输入关卡");
            int a = int.Parse(Console.ReadLine());
            int b = 0;
            if (a <= 50 && a > 0)
            {
                if (a <= 20)
                {
                    for (int n = 0; n <= a; n++)
                    {
                        b = b + n;
                    }
                }
                else if (a <= 30)
                {
                    for (int n = 0; n <= 20; n++)
                    {
                        b = b + n;
                    }
                    for (int n = 21; n <= a; n++)
                    {
                        b = b + 10;
                    }
                }
                else if (a <= 40)
                {
                    for (int n = 0; n <= 20; n++)
                    {
                        b = b + n;
                    }
                    for (int n = 21; n <= 30; n++)
                    {
                        b = b + 10;
                    }
                    for (int n = 31; n <= a; n++)
                    {
                        b = b + 20;
                    }
                }
                else if (a <= 49)
                {
                    for (int n = 0; n <= 20; n++)
                    {
                        b = b + n;
                    }
                    for (int n = 21; n <= 30; n++)
                    {
                        b = b + 10;
                    }
                    for (int n = 31; n <= 40; n++)
                    {
                        b = b + 20;
                    }
                    for (int n = 41; n <= a; n++)
                    {
                        b = b + 30;
                    }
                }
                else
                {
                    for (int n = 0; n <= 20; n++)
                    {
                        b = b + n;
                    }
                    for (int n = 21; n <= 30; n++)
                    {
                        b = b + 10;
                    }
                    for (int n = 31; n <= 40; n++)
                    {
                        b = b + 20;
                    }
                    for (int n = 41; n <= 49; n++)
                    {
                        b = b + 30;
                    }
                    for (int n = 50; n <= a; n++)
                    {
                        b = b + 100;
                    }
                }
                Console.WriteLine("分数是" + b);
            }
            else
            {
                Console.WriteLine("输入有误");
            }
            Console.ReadLine();

2.for嵌套if

            Console.WriteLine("输入关卡");
            int a = int.Parse(Console.ReadLine());
            int b = 0;
            if (a <= 50 && a > 0)
            {
                for (int n = 0; n <= a; n++)
                {
                    if (n <= 20)
                    {
                        b = b + n;
                    }
                    else if (n <= 30)
                    {
                        b = b + 10;
                    }
                    else if (n <= 40)
                    {
                        b = b + 20;
                    }
                    else if (n <= 49)
                    {
                        b = b + 30;
                    }
                    else
                    {
                        b = b + 100;
                    }
                }
                Console.WriteLine("分数是" + b);
            }
            else
            {
                Console.WriteLine("输入有误");
            }
            Console.ReadLine();

for嵌套

            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write("□");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

□

□ □

□ □ □

□ □ □ □

□ □ □ □ □

           for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <= (5 - i) + 1; j++)
                {
                    Console.Write("□");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

□ □ □ □ □

□ □ □ □

□ □ □

□ □

□

            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j < i; j++)
                {
                    Console.Write("  ");
                }
                for (int k = 1; k <= (5 - i) + 1; k++)
                {
                    Console.Write("□");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

□ □ □ □ □

   □ □ □ □

      □ □ □

         □ □

            □

            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <= 5 - i; j++)
                {
                    Console.Write("  ");
                }
                for (int h = 1; h <= i; h++)
                {
                    Console.Write("□");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

            □

         □ □

      □ □ □

   □ □ □ □

□ □ □ □ □

循环语句

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原文地址：http://www.cnblogs.com/shi2172843/p/5606547.html