This Presentation is about the logical operators with programming

1. Logical Operators
ICT Level V
COT - Jaffna
1
S.Sakthybaalan

2. 8/30/20162
Operator
 An operator is a symbol that tells the compiler to perform specific
mathematical or logical manipulations.
 C# is rich in built-in operators and provides the following kinds of
operators:
 Arithmetic Operators
 Relational Operators
 Logical Operators
 Bitwise Operators
 Assignment Operators
 Misc Operators

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Operators
Arithmetic Operators
Relational Operators
Bitwise Operators
Assignment Operators
Misc Operators
Logical Operators

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Logical Operators (Conditional
Operators)
 Logical operators allows you to combine multiple conditions.
 These operators involves at least two conditions and the final
Boolean result is determined by the operator being used.
AND
OR
XOR
NOT
Logical Operators

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Operand and Operators
 In all computer languages, expressions consist of two types of
components: operands and operators.
 Operands are the objects that are manipulated.
 Operators are the symbols that represent specific actions.
 example:
5 + x
 Note:
 All expressions have at least one operand.
operator
operands

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AND Operator (&&)
 The AND operator is used to compare two Boolean values.
 It returns true if both of the operands are true.
a b Result (AND)
0 0 0
0 1 0
1 0 0
1 1 1
0 – false
1 - true

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AND Operator in Programming
name = "Steven";
password = "Steven123";
// evaluating both expression and returns true if all are true.
if (name == "Steven" && password == "Steven123")
{
MessageBox.Show("Login Successful");
}
else
{
MessageBox.Show "Unauthorised access");
}

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OR Operator (||)
 The OR operator is similar to AND, as it is used to compare two
Boolean values.
 The OR operator returns true if either of the operand(s) are true.
a b Result (OR)
0 0 0
0 1 1
1 0 1
1 1 1
}
0 – false
1 - true

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OR Operator in Programming
string username, password;
if ((username == "Steven" || username == “Clark")
&& (password == "Steven123"))
{
MessageBox.Show("Login Successful");
}
else
{
MessageBox.Show("Unauthorised access");
}

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NOT Operator (!)
 The NOT operator is a unary operator, as it operates on a single
operand.
 The NOT operator inverts the value of a Boolean value.
 If the original value is true then the returned value is false; if the
original value is false, the return value is true.
a Result (NOT)
0 1
1 0
0 – false
1 - true

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NOT Operator in Programming
name = "Steven";
password = "Steven123";
// evaluating both expression and returns true if all are true.
if ( !(name == "Steven" && password == "Steven123"))
{
MessageBox.Show("Login Successful");
}
else
{
MessageBox.Show("Unauthorised access. Aborting…");
}

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XOR Operator (^)
 It returns false if the following condition matches:
 (i) if both or all the expression returns true.
 (ii) If both or all the expression returns false.
a b Result (XOR)
0 0 0
0 1 1
1 0 1
1 1 0
0 – false
1 - true

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XOR Operator in Programming
string name, password;
name = "Steven" ;
password = "Steven123" ;
//it returns false because both expression match.
if ((name == "Steven" ^ password == “Clark")
{
MessageBox.Show(“Access granted…");
}
else
{
MessageBox.Show (“Access Denied. Aborting…”);
}

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