Scala-オペレーター

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。 Scalaは組み込みの演算子が豊富であり、次の種類の演算子を提供します-

この章では、算術、関係、論理、ビット単位、割り当て、およびその他の演算子を1つずつ調べます。

算術演算子

次の算術演算子は、Scala言語でサポートされています。たとえば、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：/scala/scala_arithmatic_operators [例を表示]

Operator	Description	Example
PLUS	Adds two operands	A PLUS B will give 30
-	Subtracts second operand from the first	A - B will give -10
*	Multiplies both operands	A* B will give 200
/	Divides numerator by de-numerator	B/A will give 2
%	Modulus operator finds the remainder after division of one number by another	B % A will give 0

次の関係演算子はScala言語でサポートされています。たとえば、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-

link：/scala/scala_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.

次の論理演算子はScala言語でサポートされています。たとえば、変数Aが1を保持し、変数Bが0を保持すると仮定します-

リンク：/scala/scala_logical_operators [例を表示]

Operator	Description	Example
&&	It is called Logical AND operator. If both the operands are non zero then condition becomes true.	(A && B) is false.

It is called Logical OR Operator. If any of the two operands is non zero then condition becomes true.	(A
B) is true.	!	It is 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;今バイナリ形式では、次のようになります-

A = 0011 1100
B = 0000 1101
-----------------------
A&B = 0000 1100
A|B = 0011 1101
A^B = 0011 0001
~A = 1100 0011

Scala言語でサポートされているビット単位の演算子を次の表にリストします。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：/scala/scala_bitwise_operators [例を表示]

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

Scala言語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：/scala/scala_assignment_operators [例を表示]

Operator	Description	Example
=	Simple assignment operator, Assigns values from right side operands to left side operand	C = A PLUS B will assign value of A PLUS B into C
PLUS=	Add AND assignment operator, It adds right operand to the left operand and assign the result to left operand	C PLUS= A is equivalent to C = C PLUS 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

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、式の評価方法に影響します。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い-

たとえば、x = 7 + 3* 2;ここでは、演算子*の優先順位が+よりも高いため、xには20ではなく13が割り当てられます。したがって、最初に3 * 2で乗算され、7に加算されます。

次の表をご覧ください。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。