读入文本文件的内容，提供MFC界面，输入任意点的x和y值（x<70,y<40）作为着火点，“火烧连营”后，被燃烧的营帐标上字符’X’，并把整个结果输出到文件c2.txt中。-Read into the contents of text files, the MFC interface, enter at any point x and y values ​ ​ (x < 70 y < 40) as the ignition point, " Burning the Camps" , the characters in the burning tent marked with an ' X' , and output the results to the the file c2.txt.