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Borland C++ Builder: The Complete Reference
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Unless otherwise specified, local variables are stored on the stack The fact that the stack is a dynamic and changing region of memory explains why local variables cannot, in general, hold their values between function calls
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Formal Parameters
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If a function is to use arguments, then it must declare variables that will accept the values of the arguments These variables are called the formal parameters of the function They behave like any other local variables inside the function As shown in the following program fragment, their declaration occurs inside the parentheses that follow the function name
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/* return 1 if c is part of string s; 0 otherwise */ int is_in(char *s, char c) { while(*s) if(*s==c) return 1; else s++; return 0; }
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The function is_in( ) has two parameters: s and c You must tell C what type of variable these are by declaring them as just shown Once this has been done, they may be used inside the function as normal local variables Keep in mind that, as local variables, they are also dynamic and are destroyed upon exit from the function You must make sure that the formal parameters you declare are the same type as the arguments you will use to call the function If there is a type mismatch, unexpected results can occur Unlike many other languages, C is very robust and generally will do something, even if it is not what you want There are few run-time errors and no bounds checking As the programmer, you have to make sure that errors do not occur As with local variables, you may make assignments to a function s formal parameters or use them in any allowable expression Even though these variables perform the special task of receiving the value of the arguments passed to the function, they can be used like any other local variable
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Unlike local variables, global variables are known throughout the entire program and may be used by any piece of code Also, they will hold their values during the entire execution of the program Global variables are created by declaring them outside of any function They may be accessed by any expression regardless of what function that expression is in
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In the following program, you can see that the variable count has been declared outside of all functions Although its declaration occurs before the main( ) function, you could have placed it anywhere prior to its first use, as long as it was not in a function However, it is usually best to declare global variables at the top of the program
#include <stdioh> void func1(void), func2(void); int count; /* count is global */
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int main(void) { count = 100; func1(); return 0; } void func1(void) { func2(); printf("count is %d", count); /* will print 100 */ } void func2(void) { int count; for(count=1; count<10; count++) putchar(' '); }
Looking closely at this program fragment, it should be clear that although neither main( ) nor func1( ) has declared the variable count, both may use it However, func2( ) has declared a local variable called count When func2( ) references count, it will be referencing only its local variable, not the global one If a global variable and a local variable have the same name, all references to that variable name inside the function where the local variable is declared refer to the local variable and have no effect on the global variable This is a convenient benefit However, forgetting this can cause your program to act very strangely, even though it looks correct
Borland C++ Builder: The Complete Reference
Storage for global variables is in a fixed region of memory set aside for this purpose by the compiler Global variables are very helpful when the same data is used in many functions in your program You should avoid using unnecessary global variables, however, for three reasons: 1 They take up memory the entire time your program is executing, not just when they are needed 2 Using a global variable where a local variable will do makes a function less general because it relies on something that must be defined outside itself 3 Using a large number of global variables can lead to program errors because of unknown, and unwanted, side effects One of the principal points of a structured language is the compartmentalization of code and data In C, compartmentalization is achieved through the use of local variables and functions For example, here are two ways to write mul( ) a simple function that computes the product of two integers:
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