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In the program, notice that the decimal constants are followed by the m or M suffix This is necessary because without the suffix, these values would be interpreted as standard floatingpoint constants, which are not compatible with the decimal data type (We will look more closely at how to specify numeric constants later in this chapter)
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The other computer languages that I have worked with do not have a decimal data type Is it unique to C# The decimal type is not supported by C, C++, or Java as a built-in type Thus, within its direct line of descent, it is unique
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In C#, characters are not 8-bit quantities like they are in many other computer languages, such as C++ Instead, C# uses Unicode Unicode defines a character set that can represent all of the characters found in all human languages Thus, in C#, char is an unsigned 16-bit type having a range of 0 to 65,535 The standard 8-bit ASCII character set is a subset of Unicode and ranges from 0 to 127 Thus, the ASCII characters are still valid C# characters A character variable can be assigned a value by enclosing the character inside single quotes For example, this assigns X to the variable ch:
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You can output a char value using a WriteLine( ) statement For example, this line outputs the value in ch:
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ConsoleWriteLine("This is ch: " + ch);
Although char is defined by C# as an integer type, it cannot be freely mixed with integers in all cases This is because there is no automatic type conversion from integer to char For example, the following fragment is invalid:
char ch; ch = 10; // error, won't work
The reason the preceding code will not work is that 10 is an integer value and it won t automatically convert to a char Thus, the assignment involves incompatible types If you attempt to compile this code, you will see an error message Later in this chapter you will see a way around this restriction
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Q: A:
Why does C# use Unicode C# was designed to allow programs to be written for worldwide use Thus, it needs to use a character set that can represent all of the world s languages Unicode is the standard character set designed expressly for this purpose Of course, the use of Unicode is inefficient for languages such as English, German, Spanish, or French, whose characters can be contained within 8 bits But such is the price of global portability
2:
Introducing Data Types and Operators
The bool Type
The bool type represents true/false values C# defines the values true and false using the reserved words true and false Thus, a variable or expression of type bool will be one of these two values Furthermore, there is no conversion defined between bool and integer values For example, 1 does not convert to true, and 0 does not convert to false Here is a program that demonstrates the bool type:
// Demonstrate bool values using System; class BoolDemo { static void Main() { bool b; b = false; ConsoleWriteLine("b is " + b); b = true; ConsoleWriteLine("b is now " + b); // A bool value can control the if statement if(b) ConsoleWriteLine("This is executed"); b = false; if(b) ConsoleWriteLine("This is not executed");
A single bool value can control an if statement
// The outcome of a relational operator is a bool value ConsoleWriteLine("88 > 17 is " + (88 > 17)); } }
The output generated by this program is shown here:
b is b is This 88 > False now True is executed 17 is True
There are three interesting things to notice about this program First, as you can see, when a bool value is output by WriteLine( ), True or False is displayed Second, the value of a bool variable is sufficient, by itself, to control the if statement There is no need to write an if statement like this:
if(b == true)
Third, the outcome of a relational operator, such as <, is a bool value This is why the expression 88 > 17 displays the value True Further, the extra set of parentheses around 88 > 17 is necessary because the + operator has a higher precedence than the > operator
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