编写一个程序可以让用户选择在指定位置打印出不同的图形，如正立等腰三角形，倒立等腰三角形，矩形，正方形、菱形和多边形。图形由随机选择的*或者＃组成。所谓指定位置是指图形离左边屏幕最近字符与左屏幕边界的距离字符数。(注意，由于字符大小和间隔的原因，字符组成的正方形图案可能并不标准)。-Write a program to allow the user to choose the specified position in print out different graphics such as are made an isosceles triangle, inverted triangle, rectangle, square, diamond and polygon. By randomly chosen* graphics or# component. The so-called designated position is refers to the graphics from left side screen characters and screen borders recently left the distance of the number of characters. (note, due to the size and the spacing of the characters, the characters of the reason square design may not standard).