北科大面向对象课程上机实验一：编程计算图形的周长。程序可计算圆形、长方形、正方形的周长，运行时先提示用户选择图形的类型，然后，对圆形要求用户输入半径值，对长方形要求用户输入长和宽的值，对正方形要求用户输入边长的值，计算出周长的值后将其显示出来。-Greeley machine experiment object-oriented courses: Programming the perimeter of the calculation graphics. Program calculates circular, rectangular, square perimeter, runtime first prompts the user to select the type of graphics, and then require users to enter the radius value, the pair of rectangular, circular requiring user input the length and width values, requires user input to the square the value of the side length of the calculated value of the circumference of the will display it.