说明：   代码没有任何图形，甚至也没有屏幕输出，主要是保证在平台之间的高可移植性。要求输入的文件应该命名为‘gadata.txt’；系统产生的输出文件为‘galog.txt’。输入的文件由几行组成：数目对应于变量数。且每一行提供次序——对应于变量的上下界。如第一行为第一个变量提供上下界，第二行为第二个变量提供上下界，等等。
(Code without any graphics, or even no screen output, mainly to ensure a high portability between platforms. Asked to enter the file should be named ' gadata.txt' system to produce an output file ' galog.txt' . A few lines from the input file consists of: the number corresponds to the number of variables. And the provision of the order of each line- corresponding to the variable upper and lower bounds. Such as the first acts of the first variable to provide upper and lower bounds, and the second acts of the second variable to provide upper and lower bounds, and so on.)