Csharp-operators

C＃-演算子

演算子は、特定の数学的または論理的な操作を実行するようコンパイラーに指示する記号です。 C＃には豊富な組み込み演算子があり、次のタイプの演算子を提供します-

• 算術演算子
• 関係演算子
• 論理演算子
• ビット演算子
• 割り当て演算子
• その他の演算子

このチュートリアルでは、算術演算子、関係演算子、論理演算子、ビット単位演算子、代入演算子、およびその他の演算子を1つずつ説明します。

算術演算子

次の表は、C＃でサポートされているすべての算術演算子を示しています。 変数 A が10を保持し、変数 B が20を保持すると仮定します-

リンク：/csharp/csharp_arithmetic_operators [例を表示]

Operator	Description	Example
+	Adds two operands	A + B = 30
-	Subtracts second operand from the first	A - B = -10
*	Multiplies both operands	A* B = 200
/	Divides numerator by de-numerator	B/A = 2
%	Modulus Operator and remainder of after an integer division	B % A = 0
++	Increment operator increases integer value by one	A++ = 11
—	Decrement operator decreases integer value by one	A-- = 9

関係演算子

次の表は、C＃でサポートされているすべての関係演算子を示しています。 変数 A が10を保持し、変数 B が20を保持すると仮定します-

リンク：/csharp/csharp_relational_operators [例を表示]

Operator	Description	Example
==	Checks if the values of two operands are equal or not, if yes then condition becomes true.	(A == B) is not true.
!=	Checks if the values of two operands are equal or not, if values are not equal then condition becomes true.	(A != B) is true.
>	Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true.	(A > B) is not true.
<	Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true.	(A < B) is true.
>=	Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true.	(A >= B) is not true.
⇐	Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true.	(A ⇐ B) is true.

論理演算子

次の表は、C＃でサポートされているすべての論理演算子を示しています。 変数 A がブール値trueを保持し、変数 B がブール値falseを保持すると仮定します-

リンク：/csharp/csharp_logical_operators [例を表示]

Operator	Description	Example
&&	Called Logical AND operator. If both the operands are non zero then condition becomes true.	(A && B) is false.
Called Logical OR Operator. If any of the two operands is non zero then condition becomes true.	(A
B) is true.	!	Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.

ビット演算子

ビットごとの演算子はビットに対して機能し、ビットごとの演算を実行します。 ＆、|、および^の真理値表は次のとおりです-

p	q	p & q	p	q
p ^ q	0	0	0	0
0	0	1	0	1
1	1	1	1	1
0	1	0	0	1

A = 60であると仮定します。およびB = 13;その後、バイナリ形式では、次のとおりです-

A = 0011 1100

B = 0000 1101

A＆B = 0000 1100

A | B = 0011 1101

A ^ B = 0011 0001

〜A = 1100 0011

次の表に、C＃でサポートされているビット演算子を示します。 変数Aが60を保持し、変数Bが13を保持すると仮定します-

リンク：/csharp/csharp_bitwise_operators [例を表示]

[cols=",,",options="header",]
|===
|Operator |Description |Example |& |Binary AND Operator copies a bit to the result if it exists in both operands. |(A & B) = 12, which is 0000 1100 || |Binary OR Operator copies a bit if it exists in either operand. |(A | B) = 61, which is 0011 1101 |^ |Binary XOR Operator copies the bit if it is set in one operand but not both. |(A ^ B) = 49, which is 0011 0001 |~ |Binary Ones Complement Operator is unary and has the effect of 'flipping' bits. |(~A ) = -61, which is 1100 0011 in 2's complement due to a signed binary number. |<< |Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand. |A << 2 = 240, which is 1111 0000 |>> |Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand. |A >> 2 = 15, which is 0000 1111
|===

=== 割り当て演算子

C＃でサポートされている次の代入演算子があります-

リンク：/csharp/csharp_assignment_operators [例を表示]

[cols=",,",options="header",]
|===
|Operator |Description |Example |= |Simple assignment operator, Assigns values from right side operands to left side operand |C = A + B assigns value of A + B into C |+= |Add AND assignment operator, It adds right operand to the left operand and assign the result to left operand |C += A is equivalent to C = C + A |-= |Subtract AND assignment operator, It subtracts right operand from the left operand and assign the result to left operand |C -= A is equivalent to C = C - A |*= |Multiply AND assignment operator, It multiplies right operand with the left operand and assign the result to left operand |C *= A is equivalent to C = C * A |/= |Divide AND assignment operator, It divides left operand with the right operand and assign the result to left operand |C/= A is equivalent to C = C/A |%= |Modulus AND assignment operator, It takes modulus using two operands and assign the result to left operand |C %= A is equivalent to C = C % A |<<= |Left shift AND assignment operator |C <<= 2 is same as C = C << 2 |>>= |Right shift AND assignment operator |C >>= 2 is same as C = C >> 2 |&= |Bitwise AND assignment operator |C &= 2 is same as C = C & 2 |^= |bitwise exclusive OR and assignment operator |C ^= 2 is same as C = C ^ 2 ||= |bitwise inclusive OR and assignment operator |C |= 2 is same as C = C | 2
|===

=== その他の演算子

 *sizeof、typeof* 、*？など、他の重要な演算子はほとんどありません。 ：* C＃でサポートされています。

リンク：/csharp/csharp_misc_operators [例を表示]

[width="100%",cols="^34%,33%,33%",options="header",]
|===
|Operator |Description |Example |sizeof() |Returns the size of a data type. |sizeof(int), returns 4. |typeof() |Returns the type of a class. |typeof(StreamReader); |& |Returns the address of an variable. |&a; returns actual address of the variable. |* |Pointer to a variable. |*a; creates pointer named 'a' to a variable. |? : |Conditional Expression |If Condition is true ? Then value X : Otherwise value Y |is |Determines whether an object is of a certain type. |If( Ford is Car)//checks if Ford is an object of the Car class. |as |Cast without raising an exception if the cast fails. a| Object obj = new StringReader("Hello");

StringReader r = obj as StringReader;

|===

=== C＃の演算子の優先順位

演算子の優先順位は、式内の用語のグループ化を決定します。 これは、式の評価に影響します。 特定の演算子は、他の演算子よりも優先順位が高くなっています。たとえば、乗算演算子は加算演算子よりも優先順位が高くなります。

たとえば、x = 7 + 3 * 2;ここでは、演算子*の優先順位が+より高いため、xには20ではなく13が割り当てられます。したがって、最初の評価は3 * 2で行われ、その後7が追加されます。

ここでは、優先順位が最も高い演算子が表の上部に表示され、優先順位が最も低い演算子が下部に表示されます。 式内では、優先順位の高い演算子が最初に評価されます。

リンク：/csharp/csharp_operators_precedence [例を表示]

[cols=",,",options="header",]
|===
|Category |Operator |Associativity |Postfix |() [] -> . ++ - - |Left to right |Unary |+ - ! ~ ++ - - (type)* & sizeof |Right to left |Multiplicative | */% |Left to right |Additive |+ - |Left to right |Shift |<< >> |Left to right |Relational |< <= > >= |Left to right |Equality |== != |Left to right |Bitwise AND |& |Left to right |Bitwise XOR |^ |Left to right |Bitwise OR || |Left to right |Logical AND |&& |Left to right |Logical OR ||| |Left to right |Conditional |?: |Right to left |Assignment |= += -=* =/= %=>>= <<= &= ^= |= |Right to left |Comma |, |Left to right
|===