自己写的：编制计算N （N<50）个偶数之和（2+4+6+…）的子程序和接收输入N及将结果（例如：2+4+6=12）显示的主程序。

对键盘输入的字符进行判断，如果不是数字，显示提示，输入两位数。对输入的数字进行判断，如果输入的数不在1～50之

间，提示重新输入。结束时，显示提示信息，按任意键退出。

在程序的开始显示自己的学号及姓名（拼音）。

编制一个主模块，编制一个子程序模块。实现参数的传递。

-Compiled by N (N < 50) an even number of and (2+4+6+ ...) of the subroutine and receive input N and the results (for example: 2+4+6 = 12) shows the main program. The characters on the keyboard to judge, if not numbers, display the prompt, enter the double digits. To determine the numbers of input, if the number entered is not between 1 to 50, suggesting that re-enter. The end of the displayed message, press any key to exit. In the beginning of the program to show his student ID and name (Pinyin). The preparation of a main module, the preparation of a subroutine module. To achieve the parameters passed.