C Primer Plus®, Third Edition

Taking Another Step

The first sample program was easy, and the next example, shown inListing 2.2, isn't much harder.

Listing 2.2 The fathm_ft.c program.

/* fathm_ft.c -- converts 2 fathoms to feet */ #include <stdio.h> int main (void) { int feet, fathoms; fathoms = 2; feet = 6 * fathoms; printf("There are %d feet in %d fathoms!\n", feet, fathoms); return 0; }

What's new? We supplied a program description, declared multiple variables, did some multiplication, and printed the values of two variables. Let's examine these points in more detail.

Documentation

First, the program begins with a comment identifying the filename and the purpose of the program. This kind of program documentation takes but a moment to do and is helpful later on when you ...