编写一个程序，从文本文件 input.txt 中读取立方体的长、宽、高；圆的半径，根据这些 数据求出立方体的体积、圆的面积，将体积和面积同时输出到屏幕和一个名为 output.txt 的文件-Write a program that reads the cube of length, width and height a text file input.txt the radius of the circle, according to the data obtained cube vo