#define US 0 #define ENGLAND 1 in Java

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#define US 0 #define ENGLAND 1
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Borland C++ Builder: The Complete Reference
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#define FRANCE 2 #define ACTIVE_COUNTRY US #if ACTIVE_COUNTRY==US char currency[] = "dollar"; #elif ACTIVE_COUNTRY==ENGLAND char currency[] = "pound"; #else char currency[] = "franc"; #endif
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#ifs and #elifs can be nested When this occurs, each #endif, #else, or #elif is associated with the nearest #if or #elif For example, the following is perfectly valid:
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#if MAX>100 #if SERIAL_VERSION int port = 198; #elif int port = 200; #endif #else char out_buffer[100]; #endif
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In C++ Builder, you can use the sizeof compile-time operator in an #if statement For example, the next fragment determines whether a program is being compiled for a small or large arrays
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#if (sizeof(char *) == 2) printf("Program compiled for small array"); #else printf("Program compiled for large array"); #endif
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#ifdef and #ifndef
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Another method of conditional compilation uses the directives #ifdef and #ifndef, which mean if defined and if not defined, respectively The general form of #ifdef is
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The Preprocessor and Comments
#ifdef macro-name statement sequence #endif If the macro-name has been previously defined in a #define statement, the statement sequence between the #ifdef and #endif is compiled The general form of #ifndef is #ifndef macro-name statement sequence #endif If macro-name is currently undefined by a #define statement, the block of code is compiled Both the #ifdef and #ifndef can use an #else or an #elif statement For example,
#include <stdioh> #define TED 10 int main(void) { #ifdef TED printf("Hi Ted\n"); #else printf("Hi anyone\n"); #endif #ifndef RALPH printf("RALPH not defined\n"); #endif return 0; }
THE FOUNDATION OF C++
prints Hi Ted and RALPH not defined However, if TED were not defined, Hi anyone would be displayed, followed by RALPH not defined You can nest #ifdefs and #ifndefs in the same way as #ifs
#undef
The #undef directive removes a previously defined definition of the macro name that follows it That is, it undefines a macro Its general form is #undef macro-name
Borland C++ Builder: The Complete Reference
For example:
#define LEN 100 #define WIDTH 100 char array[LEN][WIDTH]; #undef LEN #undef WIDTH /* at this point both LEN and WIDTH are undefined */
Both LEN and WIDTH are defined until the #undef statements are encountered The principal use of #undef is to allow macro names to be localized to only those sections of code that need them
Using defined
In addition to #ifdef, there is a second way to determine if a macro name is defined You can use the #if directive in conjunction with the defined compile-time operator The defined operator has this general form: defined macro-name If macro-name is currently defined, then the expression is true Otherwise, it is false For example, to determine if the macro MYFILE is defined, you can use either of these two preprocessing commands:
#if defined MYFILE
#ifdef MYFILE
You may also precede defined with the ! to reverse the condition For example, the following fragment is compiled only if DEBUG is not defined
#if !defined DEBUG printf("Final version!\n"); #endif
9:
The Preprocessor and Comments
One reason for defined is that it allows the existence of a macro name to be determined by a #elif statement
THE FOUNDATION OF C++
#line
The #line directive is used to change the contents of _ _LINE_ _ and _ _FILE_ _, which are predefined identifiers in the compiler _ _LINE_ _ contains the line number of the line currently being compiled, and _ _FILE_ _ contains the name of the source file being compiled The basic form of the #line command is #line number "filename" where number is any positive integer and the optional filename is any valid file identifier The line number becomes the new value of _ _LINE_ _ The filename becomes the new value of _ _FILE_ _ #line is primarily used for debugging and special applications For example, the following specifies that the line count will begin with 100 The printf( ) statement displays the number 102 because it is the third line in the program after the #line 100 statement
#include <stdioh> #line 100 int main(void) { printf("%d\n",__LINE__); return 0; } /* reset the line counter */ /* line 100 */ /* line 101 */ /* line 102 */
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