Exercise 11, spring 2006
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The file clib.a is a library containing functions with prototypes:

double Pow3(double); //returns argument^3
double Integ(double (*)(double), double, double);

1. Learn to link the library to a C++ program and use the Pow3 function in the program. Note
that since the library is compiled with a c compiler, the 'linkage specification' 'extern...' is needed when 
using it in C++ code. When using such libraries, the user doesn't, however, usually 
have worry about this because the header files probably do that.


2. Function Integ(...) tries to numerically calculate the value of a definite integral. The 
first argument is a pointer to a function of type double Function(double) [takes one argument 
and returns value at that point, for example 
double y(double x) {return x*x;} ]
, the second argument is the lower limit and the third is the upper limit. Define some 
function and evaluate its definite integral using Integ(...).