di.c: differential and integrate calculater library Copyright (C) 2004 by syuui. All rights reserved.Redhat Linux 9.0, gcc 3.2.2 compiling passed.对信号进行微积分，做数字信号处理的朋友可能常会用到。这是前几天写的一个简单的微积分函数。请多指正。_/_/_/_/_/_/_/_/_/_/_/_/_/_/_...