Question

用C#编程输出图形，由*组成的三角形。第一行一个*形，第二行3个*形……第五行9个*

Answer 1

using System;
using System.Text;
using System.IO;

namespace BaiduTest
{
class Program
{
static void Main(string[] args)
{
for (int row = 1; row <= 5;row ++ )
{
string output ="*".PadRight(row*2 -1,'*');
output = output.PadLeft(output.Length + 5 - row, ' ');
Console.WriteLine(output);
}
Console.ReadKey();
}
}
}

Answer 2

using System;
namespace Test
{

class Demo
{
static void Main(string[] args)
{
int n = 0;
while(true)
{
Console.WriteLine("请输入要输出几行‘*’");

try{
n=Int32.Parse(Console.ReadLine());
break;
}
catch(System.Exception ex)
{
Console.WriteLine("输入有误请重试");
}
}

for(int i=1;i<=n;i++)
{
for (int num = 1; num <= n / 2-i+5;num++ ) { Console.Write(" "); }
for(int j=1;j<=2*i-1;j++)
{
Console.Write("*");
}
Console.WriteLine();
}

}
}
}