The IIT Madras BS Introduction to C Programming (Intro to C Programming) End Term paper sat on 24 Dec 2023, in the September 2023 term, set AEF3: 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.
Consider the below C program.
#include <stdio.h>int a = 10;int main(){ int a = 30; { printf("Value of a is %d", a); } printf("\nValue of a is %d", a);
return 0;}Which of the following is the correct output for the above program?
Value of a is 30
Value of a is 30
Value of a is 30
Value of a is 10
Value of a is 10
Value of a is 10
Value of a is 10
Value of a is 30
Correct answer
Value of a is 30
Value of a is 30
Consider the below C program.
#include <stdio.h>
int main(){ int a = 3; switch(a++) { case 1: a = a + 20; case 2: a = a - 3; case 3: a = a * 4; case 4: a = a / 2; default: a = a * a; } printf("%d", a);}What will be the output of the above C program?
12
2
16
1
64
Correct answer
64
Consider the below C program.
#include <stdio.h>
void compute (int a, int b){ a = a + 5; b = b - 2;}
int main(){ int a = 234, b = 316; compute(a, b); printf("%d %d", a, b); return 0;}What will be the output of the above C program?
Compile Time Error
239 314
234 316
239 316
234 314
Correct answer
234 316
Consider the below C program.
#include <stdio.h>int s(int n){ if (n == 1){ return n; } n += s(n-1); return n;}int main(){ int n= 6; printf("%d", s(n)); return 0;}How many times function s() will be called in the above program, including the first call from the main function?.
3
4
5
6
Correct answer
6
Consider the below C program.
#include <stdio.h>
void fun(int *x){ *x = *x * 2;}
int main() { int num = 4; fun(&num); printf("The value is: %d", num); return 0;}What is the output of the above C program?
The value is: 4
The value is: 8
The value is: 16
The value is: 2
Correct answer
The value is: 8
Consider an integer variable holding a value “0x89209899”. Suppose the available memory addresses are starting from the address “0x128” in a machine, which of the following stores this multibyte data in the little endian way?
Correct answer
Which of the following statements about array initialization in C is correct?
Arrays can only be initialized at the time of declaration.
Arrays can be initialized both at the time of declaration and later in the program.
Arrays can only be initialized with integer values.
The index of the first element in an array is always 1.
Correct answer
Arrays can be initialized both at the time of declaration and later in the program.
Consider the below C program.
#include <stdio.h>int main(){ char *s = "Hello C Programming !!"; char *p = s + 6;
printf("%s", p); return 0;}What will be the output of the above C program?
Hello C Programming !!
Hello C Programming
C Programming
C Programming !!
Programming
Programming !!
Correct answer
C Programming !!
Consider the C program given below.
#include <stdio.h>
struct Score{ int rollNo; int marks;};
void print_score(struct Score p){ /// Missing code}
int main(){ struct Score S1= {10001,80}; print_score(S1); return 0;}select all the correct implementations of function print_score if the output of the above program is 10001 80.
Correct answer
Consider the below C program.
#include <stdio.h>
enum Level { A, B = 7, C };
int main() { enum Level var = A; printf("%d", var);
return 0; }What will be the output of the above program?
0
6
7
1
Correct answer
0
Which of the following statements is true about unions in C?
Unions allow you to store values of different data types at a time in different members.
Unions can only contain elements of the same data type.
Unions always consume more memory than structs.
Unions are used to define functions.
Correct answer
Unions allow you to store values of different data types at a time in different members.
Consider the C program given below.
#include <stdio.h>typedef{ int* a; int len;} Array;
int main(){ Array a = {(int *)malloc(sizeof(int)*5), 5}; return 0;}If the size of int is 4 and the system uses 32-bit architecture, what are the amount of spaces allocated in the stack and in the heap respectively?
4, 20
4, 40
8, 20
8, 40
Correct answer
8, 20
*(*A + i*R + j)
*(*A + j*C + i)
*(*A + i*C + j)
*(*A + j*R + i)
Correct answer
*(*A + i*C + j)
Consider the following code.
#include <stdio.h>
int main() { FILE *file = fopen("numbers.txt", "a"); fprintf(file, "%d %d %d", 1, 2, 3); fclose(file); return 0; }What does this C program do?
Remove all data from file and write "1,2,3" to "numbers.txt".
Remove all data from file and write "1 2 3" to "numbers.txt".
Appends "1,2,3" to "numbers.txt".
Appends "1 2 3" to "numbers.txt".
Correct answer
Appends "1 2 3" to "numbers.txt".
Consider the C program given below.
#include <stdio.h>int main() { unsigned int mask = 0x04; unsigned int x = 0xDBA5;
for(int i=0;i<4;i++){ x &= ~mask; mask<<=4; } printf("%X",x);}What will be the output of the above program?
9BB1
9BA1
BBA1
BBB1
Correct answer
9BA1
Consider the following C code.
#include <stdio.h>#define ABC(a, b) a ## b
int main(){ int value = ABC(3, 4); printf("%d", value); return 0;}What will be the output of the given code?
34
7
12
Compilation error
Correct answer
34
Which of the following preprocessor directives is used to define macros in C?
define
include
ifdef
undef
Correct answer
define
Which of the following statements is/are true regarding functions in C Language?
A function signature must indicate the data type of all the function parameters.
A function signature must indicate the variable names for the function parameters.
A function does not always return a value.
A function cannot accept more than 2 parameters.
Correct answers
A function signature must indicate the data type of all the function parameters.
A function does not always return a value.
In C, which of the following is/are valid operations on pointer variables? (Select all that apply)
Dividing one pointer variable by another pointer variable.
Comparing two pointers variables for equality.
Incrementing/Decrementing a pointer variable (e.g. ptr++/ ptr–).
Multiplying two pointer variables.
Correct answers
Comparing two pointers variables for equality.
Incrementing/Decrementing a pointer variable (e.g. ptr++/ ptr–).
Consider the below C program.
#include <stdio.h>int main(){ int a = 10; int *p = &a; printf("%d", ??); return 0;}Which of the following options can replace the “??” in the above code so that the output of the program becomes 10?
*a
&a
a
p
*p
&p
Correct answers
a
*p
Correct answers
Consider the below C program.
#include<stdio.h>int main(){ typedef int Number; ?? marks = 20; printf("%d", marks);}Which of the following can be used in place of “??” in the above code to print 20 in output?
Correct answers
Consider the below C function.
int** twoDimArray(int row, int col){ int i, j; int **arr = (int**) malloc(row * sizeof(int *));
for (int i = 0; i < row; i++){ arr[i] = (int*) calloc(col, sizeof(int)); } return arr;}Which of the following statements is true wrt the above function?
The function allocates the memory for a 2D array at the time of compilation.
The function dynamically allocates the memory for a 2D array.
The function does not initialize the elements of the 2D array.
The function initializes all the elements of the 2D array with 0.
Correct answers
The function dynamically allocates the memory for a 2D array.
The function initializes all the elements of the 2D array with 0.
Consider the following code.
#include <stdio.h>
int main(){ int arr[8]; arr[0] = 0; arr[1] = 1; for (int i = 2; i < 8; i++) { arr[i] = arr[i-1] + arr[i-2]; } printf("%d", arr[6]); return 0;}What will be the output of this C program?
Note: The answer input must be an integer. For Ex: If the answer is 32, you must enter 32 only.
Correct answer: 8
Consider the below C program.
#include <stdio.h>void demo(){ static int x = 2; x++;}int main(){ demo(); demo(); demo(); demo(); return 0;}What will be the value of the static variable “x” just before the execution of the return statement in the main function?
Note: The answer must be an integer. For Ex: If the answer is 32, you must enter 32 only.
Correct answer: 6