Kinds of Triangles using for

Triangles

 /*
#
##
###
####
#####
 */

for (int x = 1; x <= 5; x++)
{
   for (int y = 1; y <= x; y++)
   {
      Console.Write("#");
   }
   Console.WriteLine(" ");
 }
 
         /*
            #
           ##
          ###
         ####
        #####
          */

            int a = 5;

            for (int x = 1; x <= a; x++)
            {
                for (int y = 1; y <= a - x; y++)
                {
                    Console.Write(" ");
                }
                for (int z = 1; z <= x; z++)
                {
                    Console.Write("#");
                }
                Console.WriteLine(" ");
            }
            
            /*            
            #####
            ####
            ###
            ##
            #
            */

            int b;

            for (int x = 1; x <= a; x++)
            {
                for (b = 1; b <= a - x; b++) { }
               
                for (int z = 1; z <= b; z++)
                {
                    Console.Write("#");
                }
                    Console.WriteLine(" ");
            }

              /*    
                       #
                      # #
                     # # #
                    # # # #
                   # # # # #
                  # # # # # #
                 # # # # # # #
                # # # # # # # #
               # # # # # # # # #
              # # # # # # # # # #
              */
            for (int x = 1; x <= 10; x++)
            {
                for (int y = 1; y < 9-x+2; y++)
                {
                    Console.Write(" ");
                }
                for (int z = 1; z <= x; z++)
                {
                    Console.Write("#");
                    Console.Write(" ");
                }
                Console.WriteLine();
            }