Cognizant Coding and Programming Round

Question 1

What will be the output of the following Python code?

```python
x = [1, 2, 3]
y = x
y.append(4)
print(x)
```

Accepted Answer

[1, 2, 3, 4]

Answer

[1, 2, 3]

Answer

[4, 1, 2, 3]

Answer

Error

Question 2

Which sorting algorithm has the worst-case time complexity of O(n^2)?

Accepted Answer

Bubble Sort

Answer

Merge Sort

Answer

Quick Sort

Answer

Heap Sort

Question 3

What does the following Java code print?

```java
int x = 5;
System.out.println(x++ + ++x);
```

Accepted Answer

12

Answer

10

Answer

11

Answer

13

Question 4

What is the purpose of the 'break' statement in a loop?

Accepted Answer

To exit the loop immediately

Answer

To skip the next iteration

Answer

To reset the loop counter

Answer

To jump to the end of the program

Question 5

What does the following C++ code snippet do?

```cpp
#include <iostream>
using namespace std;
int main() {
    int x = 10;
    int *ptr = &x;
    cout << *ptr;
    return 0;
}
```

Accepted Answer

Prints the value of x

Answer

Prints the address of x

Answer

Prints a compilation error

Answer

Prints an undefined value

Question 6

What will be the result of the following SQL query?

```sql
SELECT COUNT(*) FROM employees WHERE salary > 50000;
```

Accepted Answer

The count of employees with salary over 50,000

Answer

The sum of salaries over 50,000

Answer

A list of salaries over 50,000

Answer

An error in query syntax