15-07-03 for ()语句-打印三角形
1.
Console.Write("请输入要打印几行：");
int a = Convert.ToInt32(Console.ReadLine());
for (int i = 1; i <= a; i++)
{
for (int j = 1; j <= i; j++)
{
Console.Write("☆");
}
Console.WriteLine();
}
2.
Console.Write("请输入要打印几行：");
int a = Convert.ToInt32(Console.ReadLine());
for (int i = 1; i <= a; i++)
{
for (int j = a - i; j >= 0; j--)
{
Console.Write("☆");
}
Console.WriteLine();
}
3.
Console.Write("请输入要打印几行：");
int a = Convert.ToInt32(Console.ReadLine());
for (int i = 0; i < a; i++)
{
for (int j = 1; j <= a - (i + 1); j++)
{
Console.Write(" ");
}
for (int k = 1; k <= i + 1; k++)
{
Console.Write("☆");
}
Console.WriteLine();
}
4.
Console.Write("请输入要打印几行：");
int a = Convert.ToInt32(Console.ReadLine());
for (int i = 1; i <= a; i++)
{
for (int j = 0; j <= i - 2; j++)
{
Console.Write(" ");
}
for (int k = 0; k <= a - i; k++)
{
Console.Write("☆");
}
Console.WriteLine();
}
4.
Console.Write("请输入要打印几行：");
int a = Convert.ToInt32(Console.ReadLine());
for (int i = 1; i <= a; i++)
{
for (int k = 1; k <= a-i; k++)
{
Console.Write(" ");
}
for (int x = 1; x <= i*2-1; x++)
{
Console.Write("☆");
}
Console.WriteLine();
}
for (int j = 1; j < a; j++)
{
for (int k2 = 1; k2 <= j; k2++)
{
Console.Write(" ");
}
for (int x2 = 1; x2 <= (a-j)*2-1; x2++)
{
Console.Write("★");
}
Console.WriteLine();
}