barcode printing using c#.net PART I PART I PART I in Visual C#

Encoder Quick Response Code in Visual C# PART I PART I PART I

PART I PART I PART I
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The output from this program is shown here:
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Initial value of onum is 19 New value of onum is 10
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Here, fixed prevents o from being moved Because p points to onum, if o were moved, then p would point to an invalid location
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Accessing Structure Members Through a Pointer
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A pointer can point to an object of a structure type as long as the structure does not contain reference types When you access a member of a structure through a pointer, you must use the arrow operator, which is >, rather than the dot () operator For example, given this structure,
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struct MyStruct { public int a; public int b; public int Sum() { return a + b; } }
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you would access its members through a pointer, like this:
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MyStruct o = new MyStruct(); MyStruct* p; // declare a pointer p = &o; p->a = 10; // use the -> operator p->b = 20; // use the -> operator ConsoleWriteLine("Sum is " + p->Sum());
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Pointer Arithmetic
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There are only four arithmetic operators that can be used on pointers: ++, , +, and To understand what occurs in pointer arithmetic, we will begin with an example Let p1 be an int pointer with a current value of 2,000 (that is, it contains the address 2,000) After this expression,
p1++;
Part I:
The C# Language
the contents of p1 will be 2,004, not 2,001! The reason is that each time p1 is incremented, it will point to the next int Since int in C# is 4 bytes long, incrementing p1 increases its value by 4 The reverse is true of decrements Each decrement decreases p1 s value by 4 For example,
p1--;
will cause p1 to have the value 1,996, assuming it previously was 2,000 Generalizing from the preceding example, each time that a pointer is incremented, it will point to the memory location of the next element of its referent type Each time it is decremented, it will point to the location of the previous element of its referent type Pointer arithmetic is not limited to only increment and decrement operations You can also add or subtract integers to or from pointers The expression
p1 = p1 + 9;
makes p1 point to the ninth element of p1 s referent type, beyond the one it is currently pointing to Although you cannot add pointers, you can subtract one pointer from another (provided they are both of the same referent type) The remainder will be the number of elements of the referent type that separate the two pointers Other than addition and subtraction of a pointer and an integer, or the subtraction of two pointers, no other arithmetic operations can be performed on pointers For example, you cannot add or subtract float or double values to or from pointers To see the effects of pointer arithmetic, execute the next short program It prints the actual physical addresses to which an integer pointer (ip) and a floating-point pointer (fp) are pointing Observe how each changes, relative to its referent type, each time the loop is repeated
// Demonstrate the effects of pointer arithmetic using System; class PtrArithDemo { unsafe static void Main() { int x; int i; double d; int* ip = &i; double* fp = &d; ConsoleWriteLine("int double\n");
for(x=0; x < 10; x++) { ConsoleWriteLine((uint) (ip) + " " + (uint) (fp)); ip++; fp++; } } }
20:
U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , a n d M i s c e l l a n e o u s To p i c s
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