C Quiz - 112

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Question 1

Pick the best statement for the below program: C 
#include "stdio.h"

int main()
{
 struct {int a[2];} arr[] = {{1},{2}};

 printf("%d %d %d %d",arr[0].a[0],arr[0].a[1],arr[1].a[0],arr[1].a[1]);

 return 0;
}
  • Compile error because arr has been defined using struct type incorrectly. First struct type should be defined using tag and then arr should be defined using that tag.
  • Compile error because apart from definition of arr, another issue is in the initialization of array of struct i.e. arr[].
  • Compile error because of initialization of array of struct i.e. arr[].
  • No compile error and it’ll print 1 2 0 0
  • No compile error and it’ll print 1 0 2 0
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Question 2

Pick the best statement for the below program: C 
#include "stdio.h"

int main()
{
 struct {int a[2], b;} arr[] = {[0].a = {1}, [1].a = {2}, [0].b = 1, [1].b = 2};

 printf("%d %d %d and",arr[0].a[0],arr[0].a[1],arr[0].b);
 printf("%d %d %d\\n",arr[1].a[0],arr[1].a[1],arr[1].b);

 return 0;
}
  • Compile error because struct type (containing two fields i.e. an array of int and an int) has been specified along with the definition of array arr[] of this struct type.
  • Compile error because of incorrect syntax for initialization of array arr[].
  • No compile error and two elements of arr[] would be defined and initialized. Output would be “1 0 1 and 2 0 2”.
  • No compile error and two elements of arr[] would be defined and initialized. Output would be “1 X 1 and 2 X 2” where X is some garbage random number.
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Question 3

Pick the best statement for the below program: 

C 
#include <stdio.h>

int main()
{
    struct {
        int i;
        char c;
    } myVar = {.i = 100, .c = 'A'};
    
    printf("%d %c", myVar.i, myVar.c);
    
    return 0;
}

  • Compile error because struct type (containing two fields of dissimilar type i.e. an int and a char) has been mentioned along with definition of myVar of that struct type.

  • Compile error because of incorrect syntax of initialization of myVar. Basically, member of operator (i.e. dot .) has been used without myVar.

  • Compile error for not only B but for incorrect order of fields in myVar i.e. field c has been initialized first and then field i has been initialized.

  • No compile error and it’ll print 100 A.

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Question 4

Pick the best statement for the below program: 

C 
#include <stdio.h>

int main()
{
    union {
        int i1;
        int i2;
    } myVar = {.i2 = 100};
    
    printf("%d %d", myVar.i1, myVar.i2);
    
    return 0;
}

  • Compile error due to incorrect syntax of initialization.

  • No compile error and it’ll print “0 100”.

  • No compile error and it’ll print “100 100”.

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Question 5

Pick the best statement for the below program snippet: 
 

C 
struct {int a[2];} arr[] = {1,2};

  • No compile error and it’ll create array arr of 2 elements. Each of the element of arr contain a struct field of int array of 2 elements. arr[0]. a[0] would be 1 and arr[1].a[0] would be 2.

  • No compile error and it’ll create array arr of 2 elements. Each of the element of arr contain a struct field of int array of 2 elements. arr[0]. a[0] would be 1 and arr[0].a[1] would be 2. The second element arr[1] would be ZERO i.e. arr[1].a[0] and arr[1].a[1] would be 0.

  • No compile error and it’ll create array arr of 1 element. Each of the element of arr contain a struct field of int array of 2 elements. arr[0]. a[0] would be 1 and arr[0].a[1] would be 2.

  • None of the above

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Question 6

Consider the code fragment below : 

C++ 
#include <iostream>
using namespace std;

void f(int n) {
    if (n <= 1) {
        cout << n;
    } else {
        f(n / 2);
        cout << n % 2;
    }
}
C 
#include <stdio.h>

void f(int n) {
    if (n <= 1) {
        printf("%d", n);
    } else {
        f(n / 2);
        printf("%d", n % 2);
    }
}
Java 
void f (int n)
{ 
  if (n <=1)  {
   System.out.print(n);
  }
  else {
   f (n/2);
   System.out.print(n%2);
  }
}
Python 
def f(n):
    if n <= 1:
        print(n, end='')
    else:
        f(n // 2)
        print(n % 2, end='')
JavaScript 
function f(n) {
    if (n <= 1) {
        process.stdout.write(n.toString());
    } else {
        f(Math.floor(n / 2));
        process.stdout.write((n % 2).toString());
    }
}

What does f(173) print?

  • 010110101

  • 010101101

  • 10110101

  • 10101101

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Question 7

Consider the code fragment written in C below : 

C++ 
#include <iostream>
using namespace std;

void f(int n) {
    if (n <= 1) {
        cout << n;
    } else {
        f(n / 2);
        cout << n % 2;
    }
}
C 
void f (int n)
{
    if (n <= 1)  {
        printf ("%d", n);
    }
    else {
        f (n/2);
        printf ("%d", n%2);
    }
}
Java 
public class Main {
    public static void f(int n) {
        if (n <= 1) {
            System.out.print(n);
        } else {
            f(n / 2);
            System.out.print(n % 2);
        }
    }
}
Python 
def f(n):
    if n <= 1:
        print(n, end='')
    else:
        f(n // 2)
        print(n % 2, end='')
JavaScript 
function f(n) {
    if (n <= 1) {
        process.stdout.write(n.toString());
    } else {
        f(Math.floor(n / 2));
        process.stdout.write((n % 2).toString());
    }
}

Which of the following implementations will produce the same output for f(173) as the above code? P1 

C 
void f (int n)
{
    if (n/2)  {
        f(n/2);
    }
    printf ("%d", n%2);
}

P2 

C 
void f (int n)
{
    if (n <=1)  {
        printf ("%d", n);
    }
    else {
        printf ("%d", n%2);
        f (n/2);
    }
}

  • Both P1 and P2

  • P2 only

  • P1 only

  • Neither P1 nor P2

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C Quiz

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