Presentation on logical_operators
- 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
- 3. 8/30/20163 Operators Arithmetic Operators Relational Operators Bitwise Operators Assignment Operators Misc Operators Logical Operators
- 4. 8/30/20164 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
- 5. 8/30/20165 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
- 6. 8/30/20166 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
- 7. 8/30/20167 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"); }
- 8. 8/30/20168 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
- 9. 8/30/20169 OR Operator in Programming string username, password; if ((username == "Steven" || username == “Clark") && (password == "Steven123")) { MessageBox.Show("Login Successful"); } else { MessageBox.Show("Unauthorised access"); }
- 10. 8/30/201610 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
- 11. 8/30/201611 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…"); }
- 12. 8/30/201612 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
- 13. 8/30/201613 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…”); }
- 14. 8/30/201614