1. What is the purpose of the 'switch' statement in C?
a) To execute a block of code based on a condition
b) To iterate over a block of code multiple times
c) To select one of many code blocks to execute based on a variable's value
d) To terminate a loop prematurely
Answer:
c) To select one of many code blocks to execute based on a variable's value
Explanation:
The 'switch' statement in C is used to select and execute one code block from multiple choices based on the value of a variable.
2. Which type of expression can be used in a C 'switch' statement?
a) Integer
b) Float
c) String
d) Pointer
Answer:
a) Integer
Explanation:
The expression used in a 'switch' statement must be an integer or a character (which is internally represented as an integer).
3. What keyword is used to define cases in a 'switch' statement in C?
a) case
b) select
c) option
d) break
Answer:
a) case
Explanation:
The 'case' keyword is used to define different cases in a 'switch' statement in C.
4. What is the role of the 'break' statement in a 'switch' case in C?
a) To pause the execution of the case
b) To exit the 'switch' statement
c) To prevent the execution of the next case
d) Both b) and c)
Answer:
d) Both b) and c)
Explanation:
The 'break' statement is used to exit the switch statement and to prevent the execution from falling through to the next case.
5. What will happen if the 'break' statement is omitted in a 'switch' case in C?
a) The program will crash
b) The next case will not execute
c) The execution will continue into the next case
d) The switch statement will end
Answer:
c) The execution will continue into the next case
Explanation:
If the 'break' statement is omitted, the execution will "fall through" and continue into the next case until a 'break' is encountered or the switch ends.
6. What keyword is used to define a default case in a 'switch' statement?
a) default
b) else
c) otherwise
d) none
Answer:
a) default
Explanation:
The 'default' keyword is used to define a case that will be executed if none of the other cases match.
7. How many 'default' cases can a 'switch' statement have in C?
a) One
b) Two
c) As many as needed
d) Zero
Answer:
a) One
Explanation:
A 'switch' statement can have only one 'default' case, which is executed if no other case matches.
8. What is the correct syntax for a 'switch' statement in C?
a) switch(expression) { case constant: statements; ... }
b) switch { case expression: statements; ... }
c) switch(expression) { when constant: statements; ... }
d) switch: { case expression: statements; ... }
Answer:
a) switch(expression) { case constant: statements; ... }
Explanation:
The correct syntax for a 'switch' statement includes the 'switch' keyword followed by an expression in parentheses, and then one or more 'case' statements.
9. Can a 'switch' statement in C be nested inside another 'switch' statement?
a) Yes
b) No
c) Only if the outer switch has a default case
d) Only within a 'for' loop
Answer:
a) Yes
Explanation:
'Switch' statements can be nested, meaning one switch can be placed inside another.
10. Which of the following is a valid use of a 'switch' statement in C?
a) To execute different blocks of code based on a character's value
b) To check if a condition is true or false
c) To loop through a range of numbers
d) To define functions
Answer:
a) To execute different blocks of code based on a character's value
Explanation:
'Switch' statements are commonly used to execute different blocks of code based on the value of a character or integer variable.
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