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CHAPTER 8 EXPRESSIONS AND OPERATORS
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Simple Arithmetic Operators
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The simple arithmetic operators perform the four basic arithmetic operations, and are listed in Table 8-6. These operators are binary and left-associative. Table 8-6. The Simple Arithmetic Operators
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+ * /
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Addition Subtraction Multiplication Division
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Adds the two operands. Subtracts the second operand from the first. Multiplies the two operands. Divides the first operand by the second. Integer division rounds the result toward 0 to the nearest integer.
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The arithmetic operators perform the standard arithmetic operations on all the predefined simple arithmetic types. The following are examples of the simple arithmetic operators: int int int int x1 x2 x3 x4 = = = = 5 + 6; 12 - 3; 3 * 4; 10 / 3; double double double double d1 d2 d3 d4 = = = = 5.0 + 6.0; 12.0 - 3.0; 3.0 * 4.0; 10.0 / 3.0;
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byte b1 = 5 + 6; sbyte sb1 = 6 * 5;
CHAPTER 8 EXPRESSIONS AND OPERATORS
The Remainder Operator
The remainder operator (%) divides the first operand by the second operand, ignores the quotient, and returns the remainder. Its description is given in Table 8-7. The remainder operator is binary and left-associative. Table 8-7. The Remainder Operator
Operator
Name
Remainder
Description
Divides the first operand by the second operand and returns the remainder
The following lines show examples of the integer remainder operator: 0 % 3 = 0, because 0 divided by 3 is 0 with a remainder of 0. 1 % 3 = 1, because 1 divided by 3 is 0 with a remainder of 1. 2 % 3 = 2, because 2 divided by 3 is 0 with a remainder of 2. 3 % 3 = 0, because 3 divided by 3 is 1 with a remainder of 0. 4 % 3 = 1, because 4 divided by 3 is 1 with a remainder of 1. The remainder operator can also be used with real numbers to give real remainders. Console.WriteLine("0.0f Console.WriteLine("0.5f Console.WriteLine("1.0f Console.WriteLine("1.5f Console.WriteLine("2.0f Console.WriteLine("2.5f % % % % % % 1.5f 1.5f 1.5f 1.5f 1.5f 1.5f is is is is is is {0}", {0}", {0}", {0}", {0}", {0}", 0.0f 0.5f 1.0f 1.5f 2.0f 2.5f % % % % % % 1.5f); 1.5f); 1.5f); 1.5f); 1.5f); 1.5f);
This code produces the following output: 0.0f 0.5f 1.0f 1.5f 2.0f 2.5f % % % % % % 1.5f 1.5f 1.5f 1.5f 1.5f 1.5f is is is is is is 0 0.5 1 0 0.5 1 // // // // // // 0.0 0.5 1.0 1.5 2.0 2.5 / / / / / / 1.5 1.5 1.5 1.5 1.5 1.5 = = = = = = 0 0 0 1 1 1 remainder 0 remainder .5 remainder 1 remainder 0 remainder .5 remainder 1
CHAPTER 8 EXPRESSIONS AND OPERATORS
Relational and Equality Comparison Operators
The relational and equality comparison operators are binary operators that compare their operands and return a value of type bool. These operators are listed in Table 8-8. The relational and equality operators are binary and left-associative. Table 8-8. The Relational and Equality Comparison Operators
Operator
< > <= >= == !=
Name
Less than Greater than Less than or equal to Greater than or equal to Equal to Not equal to
Description
true if first operand is less than second operand; false otherwise true if first operand is greater than second operand; false otherwise true if first operand is less than or equal to second operand; false otherwise true if first operand is greater than or equal to second operand; false otherwise true if first operand is equal to second operand; false otherwise true if first operand is not equal to second operand; false otherwise
A binary expression with a relational or equality operator returns a value of type bool.
Note Unlike C and C++, numbers in C# do not have a Boolean interpretation.
int x = 5; if( x ) ... if( x == 5 ) ...
// Wrong.
x is of type int, not type boolean.
// Fine, since expression returns a value of type boolean
When printed, the Boolean values true and false are represented by the string output values True and False. int x = 5, y = 4; Console.WriteLine("x == x is {0}", x == x); Console.WriteLine("x == y is {0}", x == y);
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