C++ Basics and Arrays Quiz

1. What is the correct way to declare a variable in C++?

A. int x = "10"; B. int x = 10; C. x int = 10; D. int = 10;

2. Which of the following is the correct file extension for a C++ source file?

A. .cp B. .cpp C. .c++ D. .cpl

3. Which keyword is used to define a constant variable in C++?

A. static B. final C. constant D. const

4. What is the output of the following code?

int a = 5;
      int b = 3;
      cout << a + b;

A. 53 B. 8 C. a + b D. Error

5. Which of the following is the correct way to include a header file in C++?

A. #include <iostream.h> B. #include "iostream" C. #include <iostream> D. import iostream;

6. What is the purpose of the 'using namespace std;' line?

A. Declares a variable named std B. Avoids using std:: before standard objects like cout C. Includes the Standard Template Library D. Initializes the program

7. Which of the following is the correct way to declare an array of 5 integers?

A. int arr[5]; B. array[5] int; C. int arr = [5]; D. int[5] arr;

8. What is the index of the first element in a C++ array?

A. -1 B. 0 C. 1 D. Depends on the array

9. What will be the output of the following code?

int arr[3] = {1, 2, 3};
      cout << arr[1];

A. 1 B. 2 C. 3 D. Error

10. Which data type is used to represent single characters in C++?

A. char B. string C. text D. letter

Exercises

1. Digit Sum Function
Problem: Write a function that takes an integer and returns the sum of its digits.
Input: 123
Output: 15

2. Reverse a Number
Problem: Write a function that reverses the digits of a number and returns it.
Input: 5602
Output:2065

3. Count Even Digits
Problem: Write a function that counts how many even digits are in a number.
Input: 82471
Output: 2 *(8 and 2)

4. Power Without Using pow()
Problem: Write a function that calculates a^b using multiplication
Input: a = 3, b = 4
Output: 81

5. ArrayProblem:
Problem: Write a function that returns the product of all element.
Input: [2, 3, 4]
Output: 24

6 Maximum Difference in Array
Problem: Find the maximum difference between any two elements in the array.
Input: [1, 10, 5, 3]
Output: 9

7. Sum of Elements at Even Indices
Problem: Write a function that sums the elements of the array found at even indices.
Input: [5, 4, 8, 2, 7]
Output: 5 + 8 + 7 = 20

8. Swap First and Last Element of Array
ProblemWrite a function that swaps the first and last elements of an array.
Input: [9, 3, 7, 1]
Output: [1, 3, 7, 9]

9. Count Unique Elements in Array
Problem: Write a function that counts the number of distinct elements in an array (no STL).
Input: [1, 2, 2, 3, 4, 1]
Output: 4(1, 2, 3, 4)

10. Circular Left Shift of Array
Problem: Implement a function that circularly shifts the array one position to the left.
Input: [1, 2, 3, 4]
Output: [2, 3, 4, 1]

C++ Basics and Arrays Quiz

C++ Basics and Arrays Quiz

Multiple Choice Questions

Exercises