struct.cc     :  a struct describing a 2d point
strc11.cc     :  a struct describing a 2d point
strc11.cc     :  a struct describing 2 integers specifying bit numbers
fields.cc     :  a struct with user-defined bit fields
array.cc      :  test program to handle an array of dynamicall created structs

to compile:
c++ -Wall -o struct struct.cc
c++ -Wall -o strc11 strc11.cc
c++ -Wall -o fields fields.cc
c++ -Wall -o array  array.cc

simple   :  2 classes describing a 2d point and a 2d line
cmuta    :  same class with "const" and "mutable" members
cross    :  same classes calling each other
friend   :  same classes calling each other, with "friend" specifier

opera    :  operators with a class describing a 2D vector

except   :  exception handling

