Editor's Note: This article has been updated since its original publication. It's been 20 years or more since I wrote my first few hundred lines of code in C, so it's about time I learned a more ...

Last time, we coded the sections of the algorithm for Step 1 and Step 3: 1.2: read in each value from the input file 1.2.1: if unknown (i.e, a '-' or '.'), leave the cell alone 1.2.2: if known: a. set ...