为了大家更方便的计算图形的周长和面积，我设计了一个实现图形的周长和面积的计算器。这个计算器可以计算圆形、矩形、三角形的周长和面积。用户输入圆的半径或者矩形的长和宽或者三角形的三边长，系统判断用户输入的是否正确，若不正确，给出提示；若正确，系统会计算出相应的周长和面积，并显示在屏幕上反馈给用户。(In order to calculate the circumference and area of the graph more conveniently, I designed a calculator to realize the perimeter and area of the figure. This calculator can calculate the perimeter and area of a circle, rectangle, triangle. If the user input the radius of the circle or the length and width of the rectangle or the three sides of the triangle, the system judges whether the user input is correct, if not correct, gives the prompt; if correct, the system accounting calculates the corresponding perimeter and the area, and displays on the screen feedback to the user.)