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16.	Define Operator and Operand.
	Operator An operator is a symbol that tells the computer to perform certain mathematical or logical manipulations. It is used to manipulate data and variables. Operands The data items that the operators act upon are called operands.
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17.	What is called ternary operator?
	The ternary operator is used to form a conditional expression. It uses three operands and hence it is called as a ternary operator. The general format is: expression1? expression2: expression3
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18.	What is the use of lock statement?
	The lock statement is used to implement the mechanism of mutual exclusion of critical sections. An object is locked until it completes the execution of its embedded statement and then the lock is released
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19.	What is checked and Unchecked Operator?
	These operators are used in arithmetic operations for overflow checking. If an operation is checked, and over flow error will be thrown when an over flow occurs. If it is not checked, the error is not reported and the overflowing bits are discarded.
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20.	List out the Special Operators in C#.
	is, as - relational operator type of - type operator size of - size operator new - object creator .(dot) - member access operator checked - overflow checking unchecked - prevention of overflow checking.
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