1. Which of the following is the correct syntax for a switch statement in C#?
Answer:
Explanation:
The correct syntax includes the 'switch' keyword followed by the variable in parentheses, and 'case' keywords for different values.
2. What keyword is used to terminate a case in a switch statement in C#?
Answer:
Explanation:
The 'break' keyword is used to terminate a case in a switch statement and exit the switch block.
3. How does a switch statement in C# behave if the break statement is omitted in a case?
Answer:
Explanation:
If the 'break' statement is omitted, the switch statement will perform "fall-through" and execute the code in the next case.
4. Which of the following data types can be used in a C# switch statement?
Answer:
Explanation:
The switch statement in C# can be used with several data types including int, string, and char.
5. What is the role of the 'default' case in a switch statement in C#?
Answer:
Explanation:
The 'default' case in a switch statement is executed if none of the other case values match the switch expression.
6. Can a case in a switch statement in C# have multiple values?
Answer:
Explanation:
In C#, a case statement can match multiple values by specifying them as a comma-separated list.
7. What is the output of the following code?
int x = 2;
switch (x)
{
case 1:
case 2:
Console.WriteLine("One or Two");
break;
default:
Console.WriteLine("Other");
}
Answer:
Explanation:
Since x is 2, the case for 2 is executed, printing "One or Two".
8. How do you handle multiple conditions with the same code in a switch statement?
Answer:
Explanation:
In C#, you can stack multiple case statements one after the other without a break statement until the last one to handle multiple conditions with the same code.
9. Which of the following is a valid use of the switch statement in C#?
Answer:
Explanation:
The correct syntax for a switch statement in C# uses 'case' for different values and 'default' for the default case.
10. In C#, can a switch statement be nested inside another switch statement?
Answer:
Explanation:
C# allows nesting of switch statements, where one switch statement can be placed inside another.
11. What is required to use a string in a switch statement in C#?
Answer:
Explanation:
In C#, strings can be used directly in switch statements without any special requirements.
12. What happens if the switch expression matches no case and there is no default case?
Answer:
Explanation:
If there's no matching case and no default case, the switch statement does nothing.
13. Can a switch statement in C# be used with boolean values?
Answer:
Explanation:
A switch statement in C# can be used with boolean values, but the cases must be explicitly true or false.
14. How do you ensure that a switch case in C# falls through to the next case?
Answer:
Explanation:
In C#, a case will fall through to the next one if the break statement is omitted. Note that explicit fall-through is not allowed; only when no code is executed in a case.
15. Which of the following is not a valid type for switch expression in C#?
Answer:
Explanation:
In C#, the switch statement does not support the float data type for the switch expression.