barcodes excel 2003 Scope Rules of Functions in .NET

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Scope Rules of Functions
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The scope rules of a language are the rules that govern whether a piece of code knows about or has access to another piece of code or data Each function is a discrete block of code A function's code is private to that function and cannot be accessed by any statement in any other function except through a call to that function (For instance, you cannot use goto to jump into the middle of another function) The code that constitutes the body of a function is hidden from the rest of the program and, unless it uses global variables or data, it can neither affect nor be affected
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Functions
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THE FOUNDATION OF C++: THE C SUBSET
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by other parts of the program Stated another way, the code and data that are defined within one function cannot interact with the code or data defined in another function because the two functions have a different scope Variables that are defined within a function are called local variables A local variable comes into existence when the function is entered and is destroyed upon exit That is, local variables cannot hold their value between function calls The only exception to this rule is when the variable is declared with the static storage class specifier This causes the compiler to treat the variable as if it were a global variable for storage purposes, but limits its scope to within the function ( 2 covers global and local variables in depth) In C (and C++) you cannot define a function within a function This is why neither C nor C++ are technically block-structured languages
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Function Arguments
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If a function is to use arguments, it must declare variables that accept the values of the arguments These variables are called the formal parameters of the function They behave like other local variables inside the function and are created upon entry into the function and destroyed upon exit As shown in the following function, the parameter declarations occur after 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 This function returns 1 if the character c is part of the string s; otherwise, it returns 0 As with local variables, you may make assignments to a function's formal parameters or use them in an expression Even though these variables perform the special task of receiving the value of the arguments passed to the function, you can use them as you do any other local variable
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Call by Value, Call by Reference
In a computer language, there are two ways that arguments can be passed to a subroutine The first is known as call by value This method copies the value of an
C++: The Complete Reference
argument into the formal parameter of the subroutine In this case, changes made to the parameter have no effect on the argument Call by reference is the second way of passing arguments to a subroutine In this method, the address of an argument is copied into the parameter Inside the subroutine, the address is used to access the actual argument used in the call This means that changes made to the parameter affect the argument By default, C/C++ uses call by value to pass arguments In general, this means that code within a function cannot alter the arguments used to call the function Consider the following program:
#include <stdioh> int sqr(int x); int main(void) { int t=10; printf("%d %d", sqr(t), t); return 0; } int sqr(int x) { x = x*x; return(x); }
In this example, the value of the argument to sqr( ), 10, is copied into the parameter x When the assignment x = x*x takes place, only the local variable x is modified The variable t, used to call sqr( ), still has the value 10 Hence, the output is 100 10 Remember that it is a copy of the value of the argument that is passed into the function What occurs inside the function has no effect on the variable used in the call
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