编制计算N （N< 50）个偶数之（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，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。

-The preparation of the subroutine of the calculation of N (N < 50), even the (2+4+6+ ...) and receives the input N and the results (e.g. 2+4+6 = 12) displayed in the main program. To judge the character of keyboard input, if not a number, to display the prompt, enter the two-digit. Judgment, if the input number is not between 1 to 50 digital input input prompted to re-enter. The end of the display, press any key to exit. In the beginning of the program to show their student number and name (phonetic). The preparation of a master module, the preparation of a subroutine modules. Achieve the parameters passed.