本程序需在DOS下运行。每运行一次可执行程序random.exe，即可显示任意两个

16进制数的加法或减法表达式及其运算结果。在减法运算中，如果被减数小于减数，显示

“Divide Overflow”的提示信息。-the process required under the DOS operating. Every time running executable random.exe. two shows can be arbitrary number of 16 Decimal Addition or subtraction expression and Operational results. The subtraction operation, if less than subtrahend minuend, shows that the "Divide Overflow" message.