楼主看看，不知道我有没有理解错题意

        static void Main(string[] args)
        {
            for (int i = 0; i < 4; i++)
            {
                for (int j = 0; j < 4; j++)
                {
                    Console.Write("*");
                }
                Console.WriteLine();
            }
            Console.ReadKey();
        }

for (int i = 1; i <= 4; i++)
            {
                for (int j = 1; j <= 4; j++)
                {
                    Console.Write("{0}\t", "*");
                }
                Console.WriteLine();
            }

for(int i=1;i<=4;i++)
{
    for(int j=1;j<=4;j++)
    {
         Console.Write("*");
    }
     Console.WriteLine();
}
Console.ReadLine();

for(int i = 0; i < 4; i ++)
{
    for(int j = 0; j < 4; j ++)
    {
        Console.Write("*");
    }
    Console.WriteLine();
}

static void Main(string[] args)
{
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            Console.Write("*");
        }
        Console.WriteLine();
    }
    Console.ReadKey();
}

for (int j = 0; j < 4; j++)
            {
               
                for (int i = 0; i < 4 ; i++)
                {
                    Console.Write("*");
                }
                Console.WriteLine("\n");
            }
            Console.ReadLine();

            int i;
            for (i = 0; i < 4; i++)
                Console.WriteLine("****");
            Console.ReadLine();


咳咳咳！！我这算是偷奸取巧吗？
其实，一个for循环也是可以的.......

你还不如不用for,直接输出4行就行了

using System;
public class test2
{
static void Main(string[] args)
{
int i;
for(i=0;i<4;i++)
{
Console.WriteLine("****\n");
}
Console.WriteLine("四行*号!");

}




}