Detailed Discription of C Language Operators section-2

RELATIONAL OPERATORS:

• Relational operators are used to compare two operands. 
• Result is either a TRUE or FALSE value. 
• The value of TRUE is 1(non zero) and the value of FALSE is 0(zero).

OPERATOR            <        >       <=        >=        ==        !=

MEANING          Less Than       Greater Than    Less Than or equal to   Greater Than or equal to            Equal to         Not Equal to

PRECEDENCE           1           1           1           1           2           2

EXAMPLE:

If  W=7   X=5    Y=10    Z=7

• X<Y        TRUE (Value 1)
• W==Z     TRUE (Value 1)
• Z>Y        FALSE (Value 0)
• W!=X      TRUE (Value 1)

LOGICAL OPERATORS:

• AND,OR and NOT are three Logical Operators. 
• The result of these operators is either TRUE or FALSE. 
• AND,OR are Binary operators. 
• NOT is Unary Operator.

OPERATOR       &&        ||        !

MEANING     Logic AND   Logic OR   Logic NOT

PRECEDENCE              2             3             1

KEY POINTS ABOUT TABLE:

• AND Operator is Equivalent to Multiplication.
• OR Operator is Equivalent to Addition. 
• The result of Logic ANDing is TRUE when both the operands are TRUE otherwise FALSE.
• The result of Logic ORing is FALSE when both the operands are FALSE otherwise TRUE.
• The result of Logic NOT is TRUE when the Operand is FALSE and vice versa.

UNARY OPERATORS:

Unary operators acts upon only one operand. They are of 3 types:

1. Unary minus
2. Logical NOT operator
3. Bitwise complement

EXAMPLES:

1) Unary Minus: 

If x=2 and y=5
z = x + (-y)
   = 2 + (-5)
   = -3
Value of z is -3 because initially y is positive integer variable, when operated by unary minus, its value changed to negative.

2) Logical NOT operator:

OPERAND     True     False

!OPERAND       False      True

3) Bitwise complement:
 Let a=10 and is equivalent to 1010 Binary value
z = ~a
   =~(1010)
   = 0101

Posted by Roky

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