Practice Top 30 C++ Programming Questions on Numbers

Practice Top 30 C++ Programming Questions on Numbers

Q1. Write a program to check whether a given number is even or odd.

Input:  
7  

Expected Output:  
7 is odd.

Q2. Write a program to calculate the sum of the digits of a given number.

Input:  
123  

Expected Output:  
Sum of digits: 6

Q3. Write a program to reverse the digits of a given number.

Input:  
456  

Expected Output:  
Reversed number: 654

Q4. Write a program to check if a given number is a prime number.

Input:  
11  

Expected Output:  
11 is a prime number.

Q5. Write a program to calculate the factorial of a given number.

Input:  
5  

Expected Output:  
Factorial: 120

Q6. Write a program to check if a given number is a perfect number.  

Input:  
6  

Expected Output:  
6 is a perfect number.

Q7. Write a program to find the GCD of two numbers.

Input:  
24 36  

Expected Output:  
GCD: 12

Q8. Write a program to find the LCM of two numbers.

Input:  
4 5  

Expected Output:  
LCM: 20

Q9. Write a program to check whether a given number is an Armstrong number.  

Input:  
153  

Expected Output:  
153 is an Armstrong number.

Q10. Write a program to check whether a given number is a palindrome.

Input:  
121  

Expected Output:  
121 is a palindrome number.

Q11. Write a program to count the number of digits in a given number.

Input:  
4567  

Expected Output:  
Number of digits: 4

Q12. Write a program to check if a number is an automorphic number.  

Input:  
76  

Expected Output:  
76 is an automorphic number.

Q13. Write a program to find the sum of the first N natural numbers.

Input:  
10  

Expected Output:  
Sum: 55

Q14. Write a program to find the product of the digits of a given number.

Input:  
234  

Expected Output:  
Product of digits: 24

Q15. Write a program to find the smallest digit in a given number.

Input:  
8731  

Expected Output:  
Smallest digit: 1

Q16. Write a program to find the largest digit in a given number.

Input:  
5289  

Expected Output:  
Largest digit: 9

Q17. Write a program to check if a number is a strong number.  

Input:  
145  

Expected Output:  
145 is a strong number.

Q18. Write a program to find all the prime factors of a given number.

Input:  
28  

Expected Output:  
Prime factors: 2 2 7

Q19. Write a program to generate the first N numbers in the Fibonacci sequence.

Input:  
7  

Expected Output:  
Fibonacci sequence: 0 1 1 2 3 5 8

Q20. Write a program to check if a number is a perfect square.

Input:  
49  

Expected Output:  
49 is a perfect square.

Q21. Write a program to check if a number is a Harshad number.  

Input:  
18  

Expected Output:  
18 is a Harshad number.

Q22. Write a program to calculate the HCF of two numbers using the Euclidean algorithm.

Input:  
60 48  

Expected Output:  
HCF: 12

Q23. Write a program to calculate the power of a number using a loop.  

Input:  
No input is required.  

Expected Output:  
Result: 32

Q24. Write a program to find the Nth prime number.

Input:  
6  

Expected Output:  
6th prime number: 13

Q25. Write a program to print the multiplication table of a given number.

Input:  
3  

Expected Output:  
3 x 1 = 3  
3 x 2 = 6  
...  
3 x 10 = 30

Q26. Write a program to check if a number is a spy number.  

Input:  
123  

Expected Output:  
123 is a spy number.

Q27. Write a program to check if a number is a neon number.  

Input:  
9  

Expected Output:  
9 is a neon number.

Q28. Write a program to check if a number is a duck number.  

Input:  
102  

Expected Output:  
102 is a duck number.

Q29. Write a program to find the sum of the squares of the digits of a number.

Input:  
34  

Expected Output:  
Sum of squares: 25

Q30. Write a program to check if a number is a binary number (contains only 0 and 1).

Input:  
101010  

Expected Output:  
101010 is a binary number.