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# Lecture 7 relational_and_logical_operators

## on Aug 23, 2011

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Programming C relational operators

Programming C relational operators

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## Lecture 7 relational_and_logical_operatorsPresentation Transcript

• Relational and Logical Operators www.eshikshak.co.in
• 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
• 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
• 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
• Relational OperatorsExpression Meaning Result5 == 3 5 is equal to 3 05 != 3 5 is not equal to 3 15>3 5 is greater than 3 15<3 5 is less than 3 0 5 is greater than or equal to5 >= 3 1 35 <= 3 5 is less than or equal to 3 0 www.eshikshak. co.in
• 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
• Logical OperatorOperator Meaning&& AND|| OR! NOT www.eshikshak. co.in
• && (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
• && (Logical AND) Expression ResultA = ( 5 != 4 ) && ( 3 + 6 == 9 ) A=1A = ( 5 == 4 ) && ( 3 + 6 == 9 ) A=0A = ( 5 == 5 ) && ( 3 + 5 == 9 ) A=0A = ( 5 == 4 ) && ( 3 + 5 == 9 ) A=0 www.eshikshak. co.in
• || (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
• || (Logical OR) Expression ResultA = ( 5 != 4 ) || ( 3 + 6 == 9 ) A=1A = ( 5 == 4 ) || ( 3 + 6 == 9 ) A=0A = ( 5 == 5 ) || ( 3 + 5 == 9 ) A=0A = ( 5 == 4 ) || ( 3 + 5 == 9 ) A=1 www.eshikshak. co.in
• www.eshikshak.co.in