使用汇编语言，MASM611实现的课程设计源代码，接受键盘的任意字符，通过预置选择键，选择相应的运算操作，计算出结果并显示-Using assembly language, MASM611 curriculum design to achieve the source code, to accept any keyboard characters, through pre-selection key, select the appropriate computing operations, calculate and display the results