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int mul(int x, int y) { return(x*y); }
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int x, y; int mul(void) { return(x*y); }
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Both functions will return the product of the variables x and y However, the generalized, or parameterized, version can be used to return the product of any two numbers, whereas the specific version can be used to find only the product of the global variables x and y
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Four storage class specifiers are supported by C They are extern static register auto
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These specifiers tell the compiler how to store the subsequent variable The general form of a variable declaration that uses one is shown here: storage_specifier type var_name; Notice that the storage specifier precedes the rest of the variable declaration Each specifier will be examined in turn C++ adds another storage-class specifier called mutable, which is described in Part Three
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THE FOUNDATION OF C++
extern
Because C allows separately compiled modules of a large program to be linked together to speed up compilation and aid in the management of large projects, there must be some way of telling all the files about the global variables required by the program The solution is to declare all of your globals in one file and use extern declarations in the other, as shown in Table 2-2 In File Two, the global variable list was copied from File One and the extern specifier was added to the declarations The extern specifier tells the compiler that the following variable types and names have been declared elsewhere In other words, extern lets the compiler know what the types and names are for these global variables without actually creating storage for them again When the two modules are linked, all references to the external variables are resolved In real world, multifile programs, extern declarations are normally contained in a header file that is simply included with each source code file This is both easier and less error prone than manually duplicating extern declarations in each file When a declaration creates storage for a variable, it is called a definition In general, extern statements are declarations, but not definitions (If an extern declaration includes an initializer, it becomes a definition) They simply tell the compiler that a definition exists elsewhere in the program Here is another example that uses extern Notice that the global variables first and last are declared after main( )
#include <stdioh> int main(void) { extern int first, last; /* use global vars */ printf("%d %d", first, last); return 0; } /* global definition of first and last */ int first = 10, last = 20;
Borland C++ Builder: The Complete Reference
File One
int x, y; char ch; int main(void) { /* */ } void func1(void) { x = 123; } Table 2-2
File Two
extern int x, y; extern char ch; void func22(void) { x = y / 10; } void func23(void) { y = 10; }
Using Global Variables in Separately Compiled Files
This program outputs 10 20 because the global variables first and last used by the printf( ) statement are initialized to these values Because the extern declaration tells the compiler that first and last are declared elsewhere (in this case, later in the same file), the program can be compiled without error even though first and last are used prior to their definition It is important to understand that the extern variable declarations as shown in the preceding program are necessary only because first and last had not yet been declared prior to their use in main( ) Had their declarations occurred prior to main( ), then there would have been no need for the extern statement Remember, if the compiler finds a variable that has not been declared within the current block, the compiler checks if it matches any of the variables declared within enclosing blocks If it does not, the compiler then checks the global variables If a match is found, the compiler assumes that that is the variable being referenced The extern specifier is needed when you want to use a variable that is declared later in the file
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