Categories:
.NET (357)
C (330)
C++ (183)
CSS (84)
DBA (2)
General (7)
HTML (4)
Java (574)
JavaScript (106)
JSP (66)
Oracle (114)
Perl (46)
Perl (1)
PHP (1)
PL/SQL (1)
RSS (51)
Software QA (13)
SQL Server (1)
Windows (1)
XHTML (173)
Other Resources:
How can I construct preprocessor if expressions which compare strings?
How can I construct preprocessor if expressions which compare strings?
✍: Guest
You can't do it directly; preprocessor #if arithmetic uses only integers. An alternative is to #define several macros with symbolic names and distinct integer values, and implement conditionals on those:
#define RED 1
#define BLUE 2
#define GREEN 3
#if COLOR == RED
/* red case */
#else
#if COLOR == BLUE
/* blue case */
#else
#if COLOR == GREEN
/* green case */
#else
/* default case */
#endif
#endif
#endif
(Standard C specifies a new #elif directive which makes if/else chains like these a bit cleaner.)
2016-02-05, 7125👍, 0💬
Popular Posts:
What is shadowing ? When two elements in a program have same name, one of them can hide and shadow t...
From performance point of view how do they rate ? Repeater is fastest followed by Datalist and final...
Write an equivalent expression for x%8? x&7
How To Use Subqueries in the FROM clause? - MySQL FAQs - SQL SELECT Statements with JOIN and Subquer...
How To Assign Debug Privileges to a User? - Oracle DBA FAQ - Introduction to Oracle SQL Developer In...