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

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

PART I PART I PART I
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Here is the output from the program:
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Distance to the sun: 5892480000000 inches
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Clearly, the result could not have been held in an int or uint variable The smallest integer types are byte and sbyte The byte type is an unsigned value between 0 and 255 Variables of type byte are especially useful when working with raw binary data, such as a byte stream produced by some device For small signed integers, use sbyte Here is an example that uses a variable of type byte to control a for loop that produces the summation of the number 100:
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// Use byte
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Part I:
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using System; class Use_byte { static void Main() { byte x; int sum; sum = 0; for(x = 1; x <= 100; x++) sum = sum + x; ConsoleWriteLine("Summation of 100 is " + sum); } }
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Summation of 100 is 5050
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Since the for loop runs only from 0 to 100, which is well within the range of a byte, there is no need to use a larger type variable to control it When you need an integer that is larger than a byte or sbyte, but smaller than an int or uint, use short or ushort
Floating-Point Types
The floating-point types can represent numbers that have fractional components There are two kinds of floating-point types, float and double, which represent single- and doubleprecision numbers, respectively The type float is 32 bits wide and has an approximate range of 15E 45 to 34E+38 The double type is 64 bits wide and has an approximate range of 5E 324 to 17E+308 Of the two, double is the most commonly used One reason for this is that many of the math functions in C# s class library (which is the NET Framework library) use double values For example, the Sqrt( ) method (which is defined by the library class SystemMath) returns a double value that is the square root of its double argument Here, Sqrt( ) is used to compute the radius of a circle given the circle s area:
// Find the radius of a circle given its area using System; class FindRadius { static void Main() { Double r; Double area; area = 100; r = MathSqrt(area / 31416);
3:
D a t a Ty p e s , L i t e r a l s , a n d Va r i a b l e s
ConsoleWriteLine("Radius is " + r); } }
PART I PART I PART I
The output from the program is shown here:
Radius is 178412203012729
One other point about the preceding example As mentioned, Sqrt( ) is a member of the Math class Notice how Sqrt( ) is called; it is preceded by the name Math This is similar to the way Console precedes WriteLine( ) Although not all standard methods are called by specifying their class name first, several are, as the next example shows The following program demonstrates several of C# s trigonometric functions, which are also part of C# s math library They also operate on double data The program displays the sine, cosine, and tangent for the angles (measured in radians) from 01 to 10
// Demonstrate MathSin(), MathCos(), and MathTan()
using System; class Trigonometry { static void Main() { Double theta; // angle in radians for(theta = 01; theta <= 10; theta = theta + 01) { ConsoleWriteLine("Sine of " + theta + " is " + MathSin(theta)); ConsoleWriteLine("Cosine of " + theta + " is " + MathCos(theta)); ConsoleWriteLine("Tangent of " + theta + " is " + MathTan(theta)); ConsoleWriteLine(); } } }
Here is a portion of the program s output:
Sine of 01 is 00998334166468282 Cosine of 01 is 0995004165278026 Tangent of 01 is 0100334672085451 Sine of 02 is 0198669330795061 Cosine of 02 is 0980066577841242 Tangent of 02 is 0202710035508673 Sine of 03 is 029552020666134 Cosine of 03 is 0955336489125606 Tangent of 03 is 0309336249609623
To compute the sine, cosine, and tangent, the standard library methods MathSin( ), MathCos( ), and MathTan( ) are used Like MathSqrt( ), the trigonometric methods are called with a double argument, and they return a double result The angles must be specified in radians
Part I:
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