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6、C#基础整理(for 语句经典习题--for循环嵌套、穷举)

1、for循环嵌套----最基础题目:求阶乘的和

 int sum = 0; int n = int.Parse(Console.ReadLine()); for (int i = 0; i < n; i++) {      int sum1 = 1;//定义变量sum1,每次循环都赋予其初始值1,求阶乘专用      for (int j = 1; j <= i+1; j++)      {           sum1 = sum1 * j;      }      sum = sum + sum1;//将每次阶乘的和相加 } Console.WriteLine(sum);

2、for循环的穷举

例:100元买2元的铅笔,5元的铅笔盒,10元的文件夹,15元的彩笔,刚好花光,每样物品必须有一种,一共有多少种可能性?

int count = 0;for (int qb = 1;qb<50;qb++){     for (int he = 1; he < 20; he++)     {            for (int jia = 1; jia < 10; jia++)            {                 for (int cai = 1; cai < 7;cai++ )                 {                      if (qb * 2 + he * 5 + jia*10+cai*15== 100)                      {                           count++;                           Console.WriteLine("铅笔:{0},铅笔盒:{1},文件夹:{2},彩笔:{3}", qb, he,jia,cai);                       }                  }             }       }}Console.WriteLine(count);    

3、用 for 循环的嵌套打印一个菱形

 1             Console.WriteLine("请输入边长:"); 2             int ii = int.Parse(Console.ReadLine()); 3             Console.WriteLine("打印出来的菱形为:"); 4             //打印上面的三角形 5             for (int g = 0; g < ii; g++) 6             { 7                  8                 for (int n = ii - g; n > 1; n--) 9                 {10                     Console.Write("  ");11                 }12                 for (int m = 1; m <= g; m++)13                 {14                     Console.Write(" #");15                 }16                17                 for (int p = 1; p <= g; p++)18                 {19                     Console.Write(" #");20                 }21                 Console.WriteLine(" #");22             }23             //打印下面的三角形24             for (int j = 0; j < ii - 1; j++)25             {26                 for (int a = 1; a <= j + 1; a++)27                 {28                     Console.Write("  ");29                 }30                 for (int b = ii - j; b > 2; b--)31                 {32                     Console.Write(" #");33                 }34                 for (int c = ii - j; c > 2; c--)35                 {36                     Console.Write(" #");37                 }38                 Console.WriteLine(" #");39             } 

 

6、C#基础整理(for 语句经典习题--for循环嵌套、穷举)