Array in C Language

Q 1: What is right way to Initialize array?

A int num[6] = { 2, 4, 12, 5, 45, 5 };
B int n{} = { 2, 4, 12, 5, 45, 5 };
C int n{6} = { 2, 4, 12 };
D int n(6) = { 2, 4, 12, 5, 45, 5 };

Answer: A

Answer: Option A

Let us see how to initialize an array while declaring it. Following are a few examples that demonstrate this.

int roll[6] = { 2, 4, 12, 5, 45, 5 } ;
int array[ ] = { 2, 4, 12, 5, 45, 5 } ;
float points[ ] = { 12.3, 34.2 -23.4, -11.3 } ;

Learn more details about Single Dimensional Array in C Programming Language

Note the following points carefully:

(a) Till the array elements are not given any specific values, they are supposed to contain garbage values.
(b) If the array is initialized where it is declared, mentioning the dimension of the array is optional as in the 2nd example above

Q 2: What will be the output of the program ?


#include<stdio.h>
void main()
{
    int a[5] = {5, 1, 15, 20, 25};
    int i, j, m;
    i = ++a[1];
    j = a[1]++;
    m = a[i++];
    printf("%d, %d, %d", i, j, m);
}

A 3, 2, 15
B 2, 3, 20
C 2, 1, 15
D 1, 2, 5

Q 3: What will be the output of following program code?


#include <stdio.h>
int main(void)
{
    char p;
    char buf[10] = {1, 2, 3, 4, 5, 6, 9, 8};
    p = (buf + 1)[5];
    printf("%d", p);
    return 0;
}

A 5
B 9
C 6
D error

Q 4: An array elements are always stored in ________ memory locations.

A Sequential
B Random
C Sequential and Random
D None of the above

Q 5: let x be an array. Which of the following operations is illegal?

I.   ++x
II. x+1
III. x++
IV. x*2

A I and II
B I, II and III
C II and III
D I, III and IV

Q 6: What is the maximum number of dimensions an array in C may have?

A 2
B 10
C 20
D Theoratically no limit. The only practical limits are memory size and compilers.

Q 7: Size of the array need not be specified, when

A Initialization is a part of definition
B It is a declaratrion
C It is a formal parameter
D All of these

Q 8: Consider the following type definition.


typedef char x[10];
x myArray[5];

What will sizeof(myArray) be ? (Assume one character occupies 1 byte)

A 15
B 10
C 50
D 30

Q 9: What will be printed after execution of the following code?


void main()
{
      int arr[10] = {1,2,3,4,5};
      printf("%d", arr[5]);
}

A Garbage Value
B 5
C 6
D 0

Q 10: What will be the output of the following program?


void main()
{
      char str1[] = "abcd";
      char str2[] = "abcd";
      if(str1==str2)
            printf("Equal");
      else
            printf("Unequal");
}

A Equal
B Unequal
C Error
D None of these.

Q 11: What will be the output of the following code?


void main()
{
      int a[10];
      printf("%d %d", a[-1], a[12]);
}

A 0 0
B Garbage value 0
C 0 Garbage Value
D Garbage vlaue Garbage Value

Q 12: What does the following declaration mean? int (*ptr)[10];

A ptr is array of pointers to 10 integers
B ptr is a pointer to an array of 10 integers
C ptr is an array of 10 integers
D ptr is an pointer to array

Q 13: Array passed as an argument to a function is interpreted as

A Address of the array.
B Values of the first elements of the array.
C Address of the first element of the array.
D Number of element of the array.

Q 14: What will be the output of the program if the array begins at 65472 and each integer occupies 2 bytes?


#include
void main()
{
    int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0};
    printf("%u, %u", a+1, &a+1);
}

A 65474, 65488
B 65480, 65488
C 65480, 65496
D 65474, 65476

Q 15: What will be the output of the program?


#include<stdio.h>
int main()
{
    int arr[1] = {10};
    printf("%d", 0[arr]);
    return 0;
}

A 1
B 0
C 10
D None of these

Q 16: What will be the output of the program if the array begins at address 65486?


#include<stdio.h>
void main()
{
    int arr[] = {12, 14, 15, 23, 45};
    printf("%u, %u", arr, &arr);
}

A 65486, 65488
B 65486, 65490
C 65486, 65487
D 65486, 65486

Q 17: What will be the output of the program?


#include<stdio.h>
void main()
{
    float arr[] = {12.4, 2.3, 4.5, 6.7};
    printf("%d", sizeof(arr)/sizeof(arr[0]));
}

A 5
B 4
C 6
D no output

Q 18: Which of the following is correct way to define the function fun() in the below program?


#include<stdio.h>
void main()
{
    int a[3][4];
    fun(a);
}

A void fun(int p[][4]){}
B void fun(int *p[4]){}
C void fun(int *p[][4]){}
D void fun(int *p[3][4]){}

Q 19: Which of the following statements are correct about the program below?


#include<stdio.h>
void main()
{
    int size, i;
    scanf("%d", &size);
    int arr[size];
    for(i=1; i<=size; i++)
    {
        scanf("%d", arr[i]);
        printf("%d", arr[i]);
    }
}

A The code is erroneous since the statement declaring array is invalid.
B The code is erroneous since the subscript for array used in for loop is in the range 1 to size.
C The code is correct and runs successfully.
D The code is erroneous since the values of array are getting scanned through the loop.

Q 20: Which of the following statements are correct about an array?

1. The array int num[26]; can store 26 elements.
2. The expression num[1] designates the very first element in the array.
3. It is necessary to initialize the array at the time of declaration.
4. The declaration num[SIZE] is allowed if SIZE is a macro.

A 1
B 1, 4
C 2, 3
D 2, 4

Q 21: Which of the following function is more appropriate for reading in a multi-word string?

A scanf()
B gets()
C printf()
D puts()

Q 22: Which of the following correctly accesses the seventh element stored in arr, an array with 100 elements?

A arr[6]
B arr[7]
C arr{6}
D arr{7}

Q 23: int a[5] = {1,2,3} What is the value of a[4]?

A 0
B 3
C 2
D 1

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