Operator
| Description
| Example
|
+
| Addition - Adds values on either side of the operator
| a + b will give 30
|
-
| Subtraction - Subtracts right hand operand from left hand operand
| a - b will give -10
|
*
| Multiplication - Multiplies values on either side of the operator
| a * b will give 200
|
/
| Division - Divides left hand operand by right hand operand
| b / a will give 2
|
%
| Modulus - Divides left hand operand by right hand operand and returns remainder
| b % a will give 0
|
**
| Exponent - Performs exponential (power) calculation on operators
| a**b will give 10 to the power 20
|
//
| Floor Division - The division of operands where the result is the quotient in which the digits after the decimal point are removed.
| 9//2 is equal to 4 and 9.0//2.0 is equal to 4.0
|
==
| Checks if the value of two operands are equal or not, if yes then condition becomes true.
| (a == b) is not true.
|
!=
| Checks if the value 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 two operands are equal or not, if values are not equal then condition becomes true.
| (a <> b) is true. This is similar to != operator.
|
>
| 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.
|
=
| Simple assignment operator, Assigns values from right side operands to left side operand
| c = a + b will assigne 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
|
**=
| Exponent AND assignment operator, Performs exponential (power) calculation on operators and assign value to the left operand
| c **= a is equivalent to c = c ** a
|
//=
| Floor Dividion and assigns a value, Performs floor division on operators and assign value to the left operand
| c //= a is equivalent to c = c // a
|
&
| 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 eather 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 efect of 'flipping' bits.
| (~a ) will give -60 which is 1100 0011
|
<<
| Binary Left Shift Operator. 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 left operands value is moved right by the number of bits specified by the right operand.
| a >> 2 will give 15 which is 0000 1111
|
and
| Called Logical AND operator. If both the operands are true then then condition becomes true.
| (a and b) is true.
|
or
| Called Logical OR Operator. If any of the two operands are non zero then then condition becomes true.
| (a or b) is true.
|
not
| 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.
| not(a && b) is false.
|
in
| Evaluates to true if it finds a variable in the specified sequence and false otherwise.
| x in y, here in results in a 1 if x is a member of sequence y.
|
not in
| Evaluates to true if it finds a variable in the specified sequence and false otherwise.
| x not in y, here not in results in a 1 if x is a member of sequence y.
|
is
| Evaluates to true if the variables on either side of the operator point to the same object and false otherwise.
| x is y, here is results in 1 if id(x) equals id(y).
|
is not
| Evaluates to false if the variables on either side of the operator point to the same object and true otherwise.
| x is not y, here is not results in 1 if id(x) is not equal to id(y).
|
发表于 2013-8-31 14:44:55
发表于 2013-8-31 15:21:12
发表于 2013-8-31 15:37:23
刀刀 牛逼了