Questions on Loops for Beginners and Intermediate Learners in C++.

Loops are one of the most fundamental concepts in programming. They allow us to repeat a block of code multiple times until a certain condition is met. In this blog post, we will present some questions on loops for beginners and intermediate learners in C++, along with their solutions and explanations. We will cover two types of loops: 

 1.for loops

 2.while loops.

1.For Loops :-

A for loop is used to iterate over a range of values, or over the elements of an array or a container. The syntax of a for loop is:

for (initialization; condition; update) {

    // do something

}

The initialization is a statement that is executed once before the loop starts. It usually declares and initializes a loop variable. The condition is an expression that is evaluated before each iteration of the loop. It determines whether the loop should continue or stop. The `update` is a statement that is executed after each iteration of the loop. It usually modifies the loop variable. The do something is the block of code that we want to execute for each iteration of the loop.

Here are some questions on for loops for beginners and intermediate learners in C++:

Beginner Questions.

1. Write a for loop that prints the numbers from 1 to 10, one per line.

2. Write a for loop that prints the squares of the numbers from 1 to 10, one per line.

3. Write a for loop that prints the sum of the numbers from 1 to 10.

4. Write a for loop that prints the elements of an array in reverse order, one per line.

5. Write a for loop that prints the even numbers from an array, one per line.

Intermediate Questions.

1. Write a for loop that prints the factorial of the numbers from 1 to 10, one per line. The factorial of n is defined as n * (n-1) * (n-2) * ... * 1.

2. Write a for loop that prints the Fibonacci sequence up to 100, one per line. The Fibonacci sequence is defined as: F(0) = 0, F(1) = 1, F(n) = F(n-1) + F(n-2) for n > 1.

3. Write a for loop that prints the prime numbers up to 100, one per line. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

4. Write a for loop that prints the elements of a two-dimensional array in row-major order, one per line. A two-dimensional array is an array of arrays, where each sub-array represents a row of elements.

5. Write a for loop that prints the elements of a vector using iterators, one per line. A vector is a container that stores elements in a dynamic array, and provides methods to access and modify them. An iterator is an object that points to an element in a container, and allows us to traverse the container using increment and dereference operators.

2.While Loops.

A while loop is used to repeat a block of code while a certain condition is true. The syntax of a while loop is:

while (condition) {

    // do something

}

The condition is an expression that is evaluated before each iteration of the loop. It determines whether the loop should continue or stop. The  do something is the block of code that we want to execute while the condition is true.

Here are some questions on while loops for beginners and intermediate learners in C++:

Beginner Questions.

1. Write a while loop that prints the numbers from 1 to 10, one per line.

2. Write a while loop that prints the squares of the numbers from 1 to 10, one per line.

3. Write a while loop that prints the sum of the numbers from 1 to 10.

4. Write a while loop that reads integers from standard input until -1 is entered, and prints their average.

5. Write a while loop that reads characters from standard input until 'q' is entered, and counts how many vowels are entered.

Intermediate Questions.

1. Write a while loop that prints the factorial of the numbers from 1 to 10, one per line.

2. Write a while loop that prints the Fibonacci sequence up to 100, one per line.

3. Write a while loop that prints the prime numbers up to 100, one per line.

4. Write a while loop that reverses the elements of an array using two pointers, and prints them, one per line.

5. Write a while loop that sorts the elements of an array using bubble sort, and prints them, one per line. Bubble sort is a simple sorting algorithm that repeatedly swaps adjacent elements that are out of order, until the array is sorted.