What is Operator? Simple answer can be given using expression 4 + 5 is
equal to 9. Here 4 and 5 are called operands and + is called operator. C
language supports following type of operators.
Logical (or Relational) Operators
Lets have a look on all operators one by one.
There are following arithmetic operators supported by C language:
Assume variable A holds 10 and variable B holds 20 then:
There are following logical operators supported by C language
Bitwise operator works on bits and perform bit by bit operation.
Assume if A = 60; and B = 13; Now in binary format they will be as follows:
A = 0011 1100
B = 0000 1101
A&B = 0000 1100
A|B = 0011 1101
A^B = 0011 0001
~A = 1100 0011
There are following Bitwise operators supported by C language
There are following assignment operators supported by C language:
x = 1; takes the value on the right (e.g. 1) and puts it in the memory referenced by x. Here x
and 1 are known as L-VALUES and R-VALUES respectively L-values can be on either side of the
assignment operator where as R-values only appear on the right.
So x is an L-value because it can appear on the left as we've just seen, or on the right like
this: y = x; However, constants like 1 are R-values because 1 could appear on the right, but 1 =
x; is invalid.
There are few other operators supported by C Language.
All the operators we have discussed above can be categorised into following categories:
Postfix operators, which follow a single operand.
Unary prefix operators, which precede a single operand.
Binary operators, which take two operands and perform a
variety of arithmetic and logical operations.
The conditional operator (a ternary operator), which
takes three operands and evaluates either the second or third
expression, depending on the evaluation of the first expression.
Assignment operators, which assign a value to a variable.
The comma operator, which guarantees left-to-right
evaluation of comma-separated expressions.
Operator precedence determines the grouping of terms in an expression. This affects how an
expression is evaluated. Certain operators have higher precedence than others; for example, the
multiplication operator has higher precedence than the addition operator:
For example x = 7 + 3 * 2; Here x is assigned 13, not 20 because operator * has higher
precedenace than + so it first get multiplied with 3*2 and then adds into 7.
Here operators with the highest precedence appear at the top of the table, those with the lowest
appear at the bottom. Within an expression, higher precedenace operators will be evaluated
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