Great C programming funHEADmaster

Excellent fundamentals and displine training, many tools and techniques
exercises: gdb, emacs, valgrind, git

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+In this assignment, you will be black-box testing a few 
+broken implementations of "isPrime".  You will see
+that there are four broken implementations of isPrime:
+
+isPrime-broken1
+isPrime-broken2
+isPrime-broken3
+isPrime-broken4
+
+as well as a correct implementation:
+
+isPrime-correct
+
+All of these take one command line argument, which is the *integer*
+to test for primality.  For example, you might run
+
+$ ./isPrime-correct  3
+3 is prime
+$ ./isPrime-correct 4
+4 is not prime
+
+Your job is to find a test case for each broken implementation which
+shows that it is not correct---that is, where its behavior differs
+from that of isPrime-correct. Note that we do not expect you to brute
+force this task. Think about what types of common errors could occur.
+
+For each broken program, write the input which breaks the program
+into a file called "input.X" where X is 1, 2, 3, or 4 (so input.1 has
+the command line argument that shows that isPrime-broken1 is broken).
+
+Note that isPrime-correct's behavior is considered correct, and
+any test case which deviates from it is considered wrong.