C Sharp Interview Questions: Operators

Questions involving Operators.

1. When the division operator "/" is used with two integers what is result?
Answer: An integer division with the remainder discarded ( 16 / 5 is 3).

2. What is the operator "%"?
Answer: It returns the remainder from the division.

3. What are the operators "" and ""? How do the differ?
Answer:
Operator "" is the bitwise-or operator.
It accepts boolean operands and integer operands.
The second parameter is always evaluated.
For integer operatands the individual bit places are or'ed separately.

Operator "" is the condition-or operator.
If the first operand is true the second parameter will not be evaluated.

4. What are the operators "&" and "&&"? How do the differ?
Answer:
Operator "&" is the bitwise-and operator.
It accepts boolean operands and integer operands.
The second parameter is always evaluated.
For integer operands the individual bit places are and'ed separately.

Operator "&&" is the condition-and operator.
If the first operand is false the second parameter will not be evaluated.

5. What are the operators '>>' and '<<'? Which mathematical operations are similiar? Answer: Operator '>>' is the right shift operator (right bit shift). It is similar to dividing by a power of 2.
Operator '<<' is the left shift operator (left bit shift). It is similar to multiplying by a power of 2.

6. What are the operators '?:' and '??' ?
Answer:
Operator '?:' is the conditional operator and is used in a statement in the form:
(conditional expression) ? (expression 1) : (expression 2)
If the (conditional expression) evaluates to true then the result of (expression 1) is returned.
If the (conditional expression) evaluates to false then the result of (expression 2) is returned.
Operator '??' returns the left operand if the left operand is not null otherwise it returns the right operand.