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TCS NQT Array Quiz- 1

Question 1

Time: 00:00:00

An array is also known as ___________ ?

Subscripted variable

Collective array

Ordinary variable

Similar Quantities variable

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Answer : (A)

EXPLANATION :

All elements refer to the same name.That is each element can be identified with the same name including different index value(subscript value). Hence,an array is also called as a Subscripted variable.

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Question 2

Time: 00:00:00

Till the array elements are not given any specific value, they are supposed to contain all ____________ ?

Zero

Garbage value

One

Combination of zero and one.

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Answer : (B)

EXPLANATION :

when we don't assign any value to the element, so the variable fills it as a garbage value.

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Question 3

Time: 00:00:00

If array is initialized where it is declared, then mentioning __________ of array is optional.

Data type

Dimension

name

Data type and Dimension

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Answer : (B)

EXPLANATION :

When array is initialized it automatically takes the dimension based on the initialization.

Suppose : a[][] = {{1,2,3}{4,5,6},{7,8,9}};

Automatically it will take the dimension as 3 number of rows and 3 number of coloumns.

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Question 4

Time: 00:00:00

What happen if we assign a value to an array element whose subscript exceeds the size of array ?

The program will give error

No output

Program will crash

None of these

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Answer :: (C)

EXPLANATION :

The program may crash if some important data get's overwritten.

Example : Consider the following program :

void main( )

{

int a[10]={0};

a[15] = 65;

printf("%d",&a[15]);

}
When we compile this code we get some garbage value it just simply crash the values,based on the type of compiler the garbage value may vary.

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Answer is A....The program give excess error

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Question 5

Time: 00:00:00

Which one of these is equivalent to?

int fun(int arr[])

int fun(arr)

int fun(int s[])

None of these

int fun(int arr[5])

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Answer : (C)

EXPLANATION :

None of the available options are correct as none of the options are equivalent.

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Here, ++b[1] means that firstly b[1] will be incremented so, b[1]=2 then assigned to k i.e. k=2. b[1]++ means firstly b[1] will be assigned to variable l i.e. l=2, Then value stored in b[1] will be incremented i.e. b[1]=3. b[k++] means first b[k] will be assigned to m i.e. m=32, then value of k will be incremented i.e. k=3.

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Question 6

Time: 00:00:00

In 2 Dimensional Array, it is necessary to mention _______ dimension ?

Second

first

both

none of these

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Answer : (A)

EXPLANATION :

In a two dimension array it is mandatory to mention the dimension of column as on the basis of column it will take the dimension of the row so it is necessary to mention the second dimension.

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Question 7

Time: 00:00:00

An array can be passed to a function by __________

Both a and b

Call by reference by passing base address to a function

Call by reference

call by value

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An array can be passed to a function by both Call by value as well as call by reference.

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Explaination: firstly right side of any expression is evaluated, then the left side is evaluated. So, here ++i will be evaluated at first, then a[i]. Hence, when i=0, a[1]=1, then i=1, a[2]=2,…a[4]=4 and a[0]=garbage value

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Question 8

Time: 00:00:00

What will be output of the following program

#include<stdio.h>

int

main ()

{

  int arr[4] = { 3, 4, 5, 6 };

  int k[4];

  k = arr;

  printf ("%d \ n", k[1]);

  return 0;

}

Compile Time Error

No output

Program crashes

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We get compile time error because of line k=arr;

As we can't assign array arr to k in this manner.

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Question 9

Time: 00:00:00

What will be output of the following program?

int main()

{

   int b[4]={5,1,32,4};

   int k,l,m;

   k=++b[1];

   l=b[1]++;

   m=b[k++];

   printf(“%d, %d, %d”,k,l,m);

   return 0;

}

2, 2, 4

2, 3, 32

3, 2, 32

3, 2, 4

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k = ++b[1], k = 2
l = b[1]++, l = 2
m = b[k++], m = 32, k = 3

print -> k, l, m = 3, 2, 32

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Question 10

Time: 00:00:00

What will be output of the following program where c=65474 and int=2 bytes ?

int main()

{

       int c[3][4]={1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0}; 

       printf(“%u, %u\n”, c+1, &c+1);

       return 0;

}

65482, 65498

65476, 65476

65476, 65498

No output

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Answer :(A)

EXPLANATION :

int c[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0}; The array c[3][4] is declared as an integer array having the 3 rows and 4 colums dimensions.

printf("%u, %u\n", c+1, &c+1);

The base address(also the address of the first element) of array is 65472.
For a two-dimensional array like a reference to array has type "pointer to array of 4 ints". Therefore, c+1 is pointing to the memory location of first element of the second row in array c. Hence 65474 + (4 ints * 2 bytes) = 65482.

Then, &c has type "pointer to array of 3 arrays of 4 ints", totally 12 ints. Therefore, &c+1 denotes "12 ints * 2 bytes * 1 = 24 bytes".
Hence, begining address 65474 + 24 = 65496. So, &c+1 = 65498.

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Question 11

Time: 00:00:00

What will be output of the following program ?

#include <stdio.h>

int main ()

{

  int a[5], i = 0;

  while (i < 5)

    {

      a[i] = ++i;

    }

  for (i = 0; i < 5; i++)

    {

      printf ("%d,"", a[i]);

    }

  return 0;

}

Error

Program crash

1,2,3,4,5

garbage value,1,2,3,4

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Answer :: (A)

EXPLANATION :

As we know the array index starts at 0

Since we are using pre-increment addition operator so value of i will be increased to 1 and garbage value will be stored at 0th index and 1,2,3,4 at the 1st,2nd,3rd and 4th index.

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Question 12

Time: 00:00:00

What will be output of the following program ?

int main()

{

      float a[]={12.4, 2.3, 4.5, 6.7};

      printf(“%d, %d”, sizeof(a), sizeof(a[0]));

      return 0;

}

16 bytes, 4 bytes

4 bytes, 4 bytes

8 bytes, 4 bytes

None of these

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Answer : (A)

EXPLANATION :

The size of the float array is 16 bytes and the size of each float element is 4 bytes.

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