Question

k2m.cpp  

Write a program which converts kilometers to miles and miles to kilometers.

Input value (m or km)is in argv[1]

Program is accessed by "k2m" or "m2k", using Unix' ability to assign
SYMBOLIC LINKS to files, so they have multiple names.
The program knows to do kilometers -> or miles -> km by examining its 
name in argv[0].

(It does a string comparison on argv[0]).

Miles to kilometers:

m2k

Kilometers to miles:

k2m

If you're developing on a Windows machine (no Symbolic Links), just
copy the compiled *.EXE file to the other name.

copy k2m.exe m2k.exe

That way, each program can know what it is doing by looking at its name.

The math:

1 kilometer equals 0.62137 miles.