摘要
符号变量在程序中起着至关重要的作用。本文通过对符号变量的作用域及可视性的阐述,旨在使读者设计程序时,能正确地定义变量和引用变量。程序执行后,得到最终的正确结果。
Symbolic variable plays a very important role in program.By expounding t he effective scale and visibility of symbolic variable,th is writer intends to enable programmers to correctly define and quote the symbolic variable for a right result.
