How many spaces are typically set as the default tab size in programming?

What type of reference should be used in vector arithmetic?

What is the symbol "*" called?

  Which of the following is the disadvantage of sparse matrices over normal matrices? 

Which of the following is the correct syntax to pass an array as a parameter to a function?

#include<stdio.h>

int main()

{

    int k;

    for (k = 0; k < 3; k++)

    {

        printf("Hello");

    }

    return 0;

}

Which of the following is the correct recurrence for worst case of binary search?

The longevity of a variable refers to

Point out the error (if any) in the following C code?

#include <stdio.h>

enum abekus {
    a, b, c
};

int main()

{
    enum abekus n;
    printf("%d", n);
}

When is a copy constructor called in C++?