Programming C relational operators

1. Relational and Logical Operators
www.eshikshak.co.in

2. Relational Operators
● Compare two values
Result
1 True
0 False
● Six Operators, No space between the operator
Operator Meaning
== Equal to
!= Not Equal to
< Less than
> Greater than
<= Less than or equal to
>= Greater than or equal to
www.eshikshak.
co.in

3. Relational Operators
● If arithmetic expression on either side of relational
operator, than arithmetic expression will be
evaluated first and then the results are compared.
● All of these operators are known as binary operator,
as they required two expressions as operands.
● They are used with condition statements
www.eshikshak.
co.in

4. Example
● if ( value == 0 )
●{
● printf (“The value you entered was zero.n”) ;
● printf(“Please try again.n”) ;
●}
● else
●{
● printf (“Value = %d.n”, value) ;
●}
www.eshikshak.
co.in

5. Relational Operators
Expression Meaning Result
5 == 3 5 is equal to 3 0
5 != 3 5 is not equal to 3 1
5>3 5 is greater than 3 1
5<3 5 is less than 3 0
5 is greater than or equal to
5 >= 3 1
3
5 <= 3 5 is less than or equal to 3 0
www.eshikshak.
co.in

6. Logical Operator
● Sometimes we need to test multiple
conditions in order to make a decision.
● Logical operators are used for combining
simple conditions to make complex
conditions.
www.eshikshak.
co.in

7. Logical Operator
Operator Meaning
&& AND
|| OR
! NOT
www.eshikshak.
co.in

8. && (Logical AND)
● (expression1 && expression2)
● expression1 expression2 Overall Result
True True True
(non-zero) (non-zero) (non-zero)
True False False
(non-zero) (zero) (zero)
False True False
(zero) (non-zero) (zero)
False False False
(zero) (zero) (zero)
www.eshikshak.
co.in

9. && (Logical AND)
Expression Result
A = ( 5 != 4 ) && ( 3 + 6 == 9 ) A=1
A = ( 5 == 4 ) && ( 3 + 6 == 9 ) A=0
A = ( 5 == 5 ) && ( 3 + 5 == 9 ) A=0
A = ( 5 == 4 ) && ( 3 + 5 == 9 ) A=0
www.eshikshak.
co.in

10. || (Logical OR)
● (expression1 || expression2)
expression1 expression2 Overall Result
True True True
(non-zero) (non-zero) (non-zero)
True False True
(non-zero) (zero) (non-zero)
False True True
(zero) (non-zero) (non-zero)
False False False
(zero) (zero) (zero)
www.eshikshak.
co.in

11. || (Logical OR)
Expression Result
A = ( 5 != 4 ) || ( 3 + 6 == 9 ) A=1
A = ( 5 == 4 ) || ( 3 + 6 == 9 ) A=0
A = ( 5 == 5 ) || ( 3 + 5 == 9 ) A=0
A = ( 5 == 4 ) || ( 3 + 5 == 9 ) A=1
www.eshikshak.
co.in

12. www.eshikshak.co.in