The IIT Madras BS Programming in C (Programming in C) End Term paper sat on 21 Dec 2025, in the September 2025 term: 25 questions for 100 marks in 180 minutes. Every question is below with its answer. Take it as a timed mock test to be marked, or read it through first.
Which of the following statements are true about the switch statement in C?
default case is compulsory in every switch.
Multiple case labels can share the same code block.
break is optional in a switch case.
A switch can be written inside another switch.
Correct answers
Multiple case labels can share the same code block.
break is optional in a switch case.
A switch can be written inside another switch.
What will be the output of the following program?
z = 19
z = 11
z = 0
z = 5
Correct answer
z = 0
What will be the output of the following program?
1 3 5 7
1 3 3 5 7
1 3 5
1 9 3
Correct answer
1 9 3
What will be the output of the following program?
Inside: a = 7, b = 3 Outside: x = 3, y = 7
Inside: a = 7, b = 3 Outside: x = 7, y = 3
Inside: a = 3, b = 7 Outside: x = 7, y = 3
Inside: a = 3, b = 7 Outside: x = 3, y = 7
Correct answer
Inside: a = 7, b = 3 Outside: x = 7, y = 3
Consider the following program.
Assuming each function must complete before its result is used in the next function call, in which sequence are the functions executed?
main → sub → sub → divi → printf
main → printf → sub → sub → divi
main → divi → sub → sub → printf
main → sub → divi → sub → printf
Correct answer
main → sub → sub → divi → printf
Which of the following is true about recursion in C?
Every recursive function must have a base case.
Recursive functions are always faster than iterative ones.
Recursion always leads to infinite calls.
A recursive function can call itself directly or indirectly.
Correct answers
Every recursive function must have a base case.
A recursive function can call itself directly or indirectly.
Which of the following correctly declares and initializes a pointer to a float variable f?
Correct answer
What will be the output of the following program?
Hello
World
o World
ello World
Correct answer
World
What will be the output of the following program?
Correct answer: 13
Consider the following program.
If the output is 450, which of the following lines could replace the missing statement?
Correct answers
Which operator is used in C for dynamic memory deallocation?
free()
delete
remove()
dispose()
Correct answer
free()
What will be the output of the following program?
5
4
0
1
Correct answer
4
What will be the output of the following program?
20
30
99
Garbage Value
Correct answer
99
Which of the following are valid storage classes in C?
auto
static
volatile
extern
Correct answers
auto
static
extern
What will be the output of the following program?
3
5
6
7
Correct answer
6
What will be the output of the following program?
Correct answer: 48
Which keyword in C prevents a variable from being modified after initialization?
restrict
volatile
const
static
Correct answer
const
What will be the output of the following program?
5 5 5
5 6 7
7 7 7
10 11 11
Correct answer
5 6 7
What will be the output of the following program?
a P
a r
a e
e p
Correct answer
a r
Which of the following are valid file handling modes in C?
"rb"
"wx"
"a+"
"r+"
Correct answers
"rb"
"a+"
"r+"
Consider the following program.
If data.txt is empty before execution, what will be printed?
Nothing
H
e
Error
Correct answer
H
What will be the output of the following program?
B
A
F
0
Correct answer
B
In macros, which operator is used to substitute the actual argument as a string?
(A figure from the original paper is missing from the source site.)
Correct answer
What will be the output of the following program?
Correct answer: 11
What will be the output of the following program?
5
4
20
Compiler error
Correct answer
5
