Common-Sense C: Advice and Warnings for C and C Programmers by Paul Conte

By Paul Conte

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Meanwhile, your code can be readable and reliable. Give Me a Break As W. A. " C's switch statement could be the all-time award winner in the "stupid efficiency" category. The error in the following code fragment may be obvious outside the context of a larger program; but in real programs, such errors are easy to make and hard to find. switch (color) { case 1: printf("red\n"); case 2: printf("blue\n"); } Given this code, when color is 1, both "red" and "blue" are printed. The proper code is switch (color) { case 1: printf("red\n"); break; case 2: printf("blue\n"); } Of course, when you add another color, you'd better add another break after the second case.

I've found three "classes" of visibility adequate to define most variables and functions: * Local: visible only within a single function or nested block. * Share: visible in all functions in a file, but not outside the file. * Export: visible in all functions in a program (all files). Export visibility implies share visibility. The file that "exports" an object allocates its storage. You pick an appropriate one of these visibility classes when you define a variable. If a variable is local, you generally are done with your declarations for that object.

Fortunately, there's a very simple rule for business (and most other) programmers to follow: Never use the C switch statement. This stricture is not at all burdensome. As I indicated, most instances of C's switch should have a break after every case. 1. This solution has a compact, table-oriented layout and avoids the hazards of raw C. 1 - Coding an ELSEIF in C with Macros IF color EQ 1 THEN printf("red\n"); ELSEIF color EQ 2 THEN printf("blue\n"); ELSE printf("Invalid color\n"); ENDIF One Last Comment Most programmers know that "comments lie," which is why high-level languages should let you directly express what your program does rather than force you to comment unclear code.

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