Introduction to Scala Operators
Operators are the symbols that perform the operation on some values. These values are known as operands. Scala has following operators –
- Arithmetic Operators
- Relational Operators
- Logical Operators
- Assignment Operators
- Bitwise Operators
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Arithmetic Operators
| Operator | Operator Name | Description | Example |
| + | Addition | Adds two operands | I = 40, J= 20I + J = 60 |
| – | Subtraction | Subtracts second operand from the first | I = 40, J= 20I – J = 20 |
| * | Multiplication | Multiplies both operands | I = 40, J= 20I * J = 800 |
| / | Divide | Perform division operation | I = 40, J= 20I / J = 2 |
| % | Modulus | Return the remainder after Division | I = 40, J= 20I % J = 0 |
Relational Operators
It is also known as comparison operator because it compares the values. After comparison, it returns the Boolean value i.e. either true or false.
| Operator | Operator Name | Description | Example |
| == | Equal to | If the values of two operands are equal then then it returns true. | I = 20, J = 20(I == J) is true |
| != | Not Equal to | If the values of two operands are not equal then it returns true. | I = 20, J = 20(I == J) is False |
| < | Less than | If the value of left operand is less than the value of right operand then it returns true | I = 40, J = 20(I < J) is False |
| > | Greater than | If the value of left operand is greater than the value of right operand then it returns true | I = 40, J = 20(I > J) is True |
| <= | Less than or equal to | If the value of left operand is less than or equal to the value of right operand then it returns true. | I = 40, J = 20(I <= J) is False |
| >= | Greater than or equal to | If the value of left operand is greater than or equal to the value of right operand then it returns true. | I = 40, J = 20(I >= J) is True |
Logical Operators
Assignment Operator
| Operator | Operator Name | Description | Example |
| and | Logical AND | When Both side condition is true the result is true otherwise false | 2<1 and 2<3False |
| or | Logical OR | When at least one condition is true then the result is true otherwise false | 2<1 or 2<3True |
| not | Logical NOT | Reverse the condition | Not(5>4)False |
Assignment Operator
| Operator | Operator Name | Description | Example |
| = | Assignment | It assigns a value from right side operand to left side operand | I = 40 It assigns 40 to I |
| += | Add then assign | It performs addition and then results is assigned to left-hand operand | I+=J that meansI = I + J |
| -= | Subtract then assign | It performs subtraction and then results is assigned to left-hand operand | I-=J that meansI = I – J |
| *= | Multiply the assign | It performs multiplication and then results are assigned to the left-hand operand. | I*=J that meansI = I * J |
| /= | Divide then assign | It performs division and then results is assigned to left-hand operand | I/=J that meansI = I / J |
| %= | Modulus then assign | It performs modulus and then results is assigned to left-hand operand | I%=Jthat meansI = I % J |
| <<= | Left shift AND assignment operator | It performs Binary left shift and then results is assigned to left-hand operand | I<<=5 that means I = I << 5 |
| >>= | Right shift AND assignment operator | It performs Binary right shift and then results is assigned to left-hand operand | I>>=5 that means I = I >>=5 |
| &= | Bitwise AND assignment operator | It performs bitwise AND and then result is assigned to left-hand operand | I &= 5 that meansI = I & 5 |
| ^= | bitwise exclusive OR and assignment operator | It performs bitwise exclusive OR and then result is assigned to left-hand operand | I ^= 5 that meansI = I ^ 5 |
| |= | bitwise inclusive OR and assignment operator | It performs bitwise inclusive OR and then result is assigned to left-hand operand | I |= 5 that meansI = I | 5 |
Bitwise Operators
It performs bit by bit operation. Suppose there are two variable I = 10 and J = 20 and their binary values are
I = 10 = 0000 1010
J = 20 = 0001 0100
| Operator | Operator Name | Description | Example |
| & | Binary AND | If both bits are 1 then 1 otherwise 0 | I & J0000 0000 |
| | | Binary OR | If one of the bit is 1 then 1 otherwise 0 | I | J0001 1110 |
| ^ | Binary XOR | If both bits are same then 0 otherwise 1 | I ^ J0001 1110 |
| ~ | Binary Complement | If the bit is 1 the make it 0 and if a bit is 0 the make it 1 | ~I1111 0101 |
| << | Binary Left Shift | The left operand is moved left by the number of bits specified by the right operand. | I << 2 will give 240 i.e. 1111 0000 |
| >> | Binary Right Shift | The left operand is moved right by the number of bits specified by the right operand. | I >> 2 will give 15 i.e. 1111 |
| >>> | Shift right zero-fill operator | Left operands are shifted right by the no. of bits specified by the right operand and shifted values are filled up with 0. | I >>>2 will give 15 i.e. 0000 1111 |
Operator Precedence
| Category | Operator | Associativity |
| Postfix | () [] | Left to right |
| Unary | ! ~ | 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 |
| Assignment | = += -= *= /= %= >>= <<= &= ^= |= | Right to left |
