用visual c++6.0在屏幕上画圆，对圆的半径和坐标从键盘任意输入，然后再计算圆面积和在屏幕上画出相应的圆-With visual c++6.0 circle on the screen, on the radius and the coordinates of any input from the keyboard, and then calculate area of a circle and draw in the corresponding circle on the screen

< 模拟电子时钟的程序> 算法：将当前时间显示到屏幕，当时间发生变化时，清屏，显示新的时间（当有键盘操作时退出程序）。(显示时间格式：小时：分钟：秒)-" Analog electronic clock program" algorithm: the current time displayed on the screen, when the time change, clear screen, display the new time (when there is