qr code c# open source The C# Language in C#.NET

Encoding QR Code in C#.NET The C# Language

The C# Language
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ConsoleWriteLine(); x = 1; y = 0; ConsoleWriteLine("Series generated using y = y + ++x;"); for(i = 0; i < 10; i++) { y = y + ++x; // prefix ++ ConsoleWriteLine(y + " "); } ConsoleWriteLine(); } }
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The output is shown here:
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Series generated using y = y + x++; 1 3 6 10 15 21 28 36 45 55 Series generated using y = y + ++x; 2 5 9 14 20 27 35 44 54 65
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As the output confirms, the statement
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y = y + x++;
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adds the current values of x and y, and assigns this result back to y The value of x is incremented after its value has been obtained However, the statement
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y = y + ++x;
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obtains the value of x, increments x, and then adds that value to the current value of y This result is assigned to y As the output shows, simply changing ++x to x++ changes the number series quite substantially
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4:
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Operators
One other point about the preceding example: Don t let expressions like
y + ++x
PART I
intimidate you Although having two operators back-to-back is a bit unsettling at first glance, the compiler keeps it all straight Just remember, this expression simply adds the value of y to the value of x incremented
Relational and Logical Operators
In the terms relational operator and logical operator, relational refers to the relationships that values can have with one another, and logical refers to the ways in which true and false values can be connected together Since the relational operators produce true or false results, they often work with the logical operators For this reason they will be discussed together here The relational operators are as follows:
Operator == != > < >= <= Meaning Equal to Not equal to Greater than Less than Greater than or equal to Less than or equal to
The logical operators are shown next:
Operator & | ^ || && ! Meaning AND OR XOR (exclusive OR) Short-circuit OR Short-circuit AND NOT
The outcome of the relational and logical operators is a bool value In general, objects can be compared for equality or inequality using == and != However, the comparison operators, <, >, <=, or >=, can be applied only to those types that support an ordering relationship Therefore, all of the relational operators can be applied to all numeric types However, values of type bool can only be compared for equality or inequality since the true and false values are not ordered For example, true > false has no meaning in C#
Part I:
The C# Language
For the logical operators, the operands must be of type bool, and the result of a logical operation is of type bool The logical operators, &, |, ^, and !, support the basic logical operations AND, OR, XOR, and NOT, according to the following truth table:
p False True False True q False False True True p&q False False False True p|q False True True True p^q False True True False !p True False True False
As the table shows, the outcome of an exclusive OR operation is true when one and only one operand is true Here is a program that demonstrates several of the relational and logical operators:
// Demonstrate the relational and logical operators using System; class RelLogOps { static void Main() { int i, j; bool b1, b2; i = 10; j = 11; if(i < j) ConsoleWriteLine("i < j"); if(i <= j) ConsoleWriteLine("i <= j"); if(i != j) ConsoleWriteLine("i != j"); if(i == j) ConsoleWriteLine("this won't execute"); if(i >= j) ConsoleWriteLine("this won't execute"); if(i > j) ConsoleWriteLine("this won't execute"); b1 = true; b2 = false; if(b1 & b2) ConsoleWriteLine("this won't execute"); if(!(b1 & b2)) ConsoleWriteLine("!(b1 & b2) is true"); if(b1 | b2) ConsoleWriteLine("b1 | b2 is true"); if(b1 ^ b2) ConsoleWriteLine("b1 ^ b2 is true"); } }
The output from the program is shown here:
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