Coding Practice Questions

Warm-up Questions
1 Write a program to add two numbers? Compile
2 Write a function that takes a string and returns the string reversed? Compile
3 Write a function that prints the first n numbers of the Fibonacci sequence? Compile
4 Write a function that takes a number and returns the sum of its digits? Compile
5 Write a function that checks whether a given number is prime? Compile

Tricky Questions
1 Write a program to swap two numbers using bitwise XOR operator? Compile
2 Write a program to swap two numbers without using a third variable? Compile
3 Write a program to check even or odd without modulus and bitwise operator? Compile
4 Write a program to find the largest number in an array using a pointer? Compile
5 Write a program to print numbers from 1 to 100 without using loops? Compile

Conditional Statements
1 Write a program to input a student's marks and print the corresponding grade:
A for marks ≥ 90
B for marks ≥ 70
C for marks ≥ 50
D for marks ≥ 35
F for marks < 35 		Compile
2 Write a program to check if a number is a palindrome (reads the same backward and forward)? Compile
3 Write a program to check if a number is an Armstrong number? Compile
4 Check if a number is positive, negative, or zero? Compile
5 Check if a character is a vowel or consonant? Compile

Loops (for, while, do-while)
1 Write a program to print numbers from 1 to 100 using a loop. Compile
2 Write a program to calculate the sum of all numbers from 1 to a given number N using a loop. Compile
3 Write a program to print the multiplication table for a given number N (from 1 to 10). Compile
4 Write a program to print all even numbers from 1 to N using a loop. Compile
5 Write a program to find the factorial of a number N using a loop. Compile

Functions
1 Write a program to calculate the power of a number using a function (e.g., x^y). Compile
2 Write a program to find the maximum of two numbers using a function. Compile
3 Write a program to check if a number is prime using a function. Compile
4 Write a program to calculate the sum of digits of a number using a function. Compile
5 Write a program to reverse a string using a function. Compile

Recursion
1 Write a program to calculate the factorial of a number using recursion. Compile
2 Write a program to find the Fibonacci sequence up to N terms using recursion. Compile
3 Write a program to find the sum of natural numbers up to N using recursion. Compile
4 Write a program to reverse a number using recursion. Compile
5 Write a program to check if a number is a palindrome using recursion. Compile

Arrays
1 Write a program to find the largest element in an array. Compile
2 Write a program to find the smallest element in an array. Compile
3 Write a program to reverse an array. Compile
4 Write a program to calculate the sum of elements in an array. Compile
5 Write a program to check if an array is sorted in ascending order. Compile

Strings
1 Write a program to count the number of vowels in a string. Compile
2 Write a program to find the length of a string without using the strlen() function. Compile
3 Write a program to reverse a string without using the strrev() function. Compile
4 Write a program to check if a string is a palindrome. Compile
5 Write a program to concatenate two strings without using the strcat() function. Compile

Linked List
1 Write a program to create a linked list and display all its elements. Compile
2 Write a program to insert an element at the beginning of a linked list. Compile
3 Write a program to delete an element from the linked list. Compile
4 Write a program to reverse a linked list. Compile
5 Write a program to find the length of a linked list. Compile

OOPs (Object-Oriented Programming)
1 Write a program to create a class to represent a rectangle and calculate its area and perimeter. Compile
2 Write a program to demonstrate the use of constructor and destructor in a class. Compile
3 Write a program to create a class with private and public members and access them using member functions. Compile
4 Write a program to demonstrate inheritance by creating a derived class and calling a base class function. Compile
5 Write a program to demonstrate polymorphism using function overloading. Compile

Exception Handling
1 Write a program to demonstrate try-catch block in C++ to handle an exception when dividing by zero. Compile
2 Write a program to throw an exception if a user inputs a negative number for square root calculation. Compile
3 Write a program to handle multiple exceptions for division and array index out-of-bound error. Compile
4 Write a program to use a custom exception class to handle an invalid age input (age < 0). Compile
5 Write a program to handle exceptions using the `throw` keyword in C++ and display the exception message. Compile

Regular Expressions
1 Write a program to check if a string matches a valid email address format using regular expressions. Compile
2 Write a program to check if a string contains only numbers using regular expressions. Compile
3 Write a program to validate a phone number using regular expressions (e.g., format: 123-456-7890). Compile
4 Write a program to replace all spaces in a string with underscores using regular expressions. Compile
5 Write a program to extract all the words from a string using regular expressions. Compile

Multi-threading
1 Write a program to create two threads, where one prints numbers from 1 to 10 and the other prints numbers from 11 to 20. Compile
2 Write a program to demonstrate the use of a mutex to avoid a race condition when accessing a shared variable between threads. Compile
3 Write a program to create a thread that prints "Hello from thread!" and another that prints "Hello from main thread!" using multi-threading. Compile
4 Write a program to implement a thread pool where multiple threads are used to process tasks concurrently. Compile
5 Write a program to demonstrate thread synchronization using `std::lock_guard` to safely modify a shared variable in a multi-threaded environment. Compile