6、C#基础整理（for 语句经典习题--for循环嵌套、穷举）

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);

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);

Console.WriteLine("请输入边长：");
int ii = int.Parse(Console.ReadLine());
Console.WriteLine("打印出来的菱形为：");
//打印上面的三角形
for (int g = 0; g < ii; g++)
{

for (int n = ii - g; n > 1; n--)
{
Console.Write("  ");
}
for (int m = 1; m <= g; m++)
{
Console.Write(" #");
}

for (int p = 1; p <= g; p++)
{
Console.Write(" #");
}
Console.WriteLine(" #");
}
//打印下面的三角形
for (int j = 0; j < ii - 1; j++)
{
for (int a = 1; a <= j + 1; a++)
{
Console.Write("  ");
}
for (int b = ii - j; b > 2; b--)
{
Console.Write(" #");
}
for (int c = ii - j; c > 2; c--)
{
Console.Write(" #");
}
Console.WriteLine(" #");
}