# Solved: loop through array backwards

Reversing the traversal order of an array is an important task in C++ programming, serving numerous purposes such as problem-solving, developing algorithms, and enhancing the dynamics of your code. It’s a fantastic way to make your code more optimized and efficient. As an experienced C++ developer, one should be familiar with this method of navigating arrays- an integral part of programming languages.

When we talk about array, it’s a collection of similar type objects stored in continuous memory locations. In practice, the index of an array starts from zero and ends at ‘total size – 1’. Array reversal is a concept in which the elements are swapped to attain the reverse ordering at a position-level.

## The Solution: Looping through an array backwards in C++

#include
using namespace std;
int main()
{
int array[] = {1, 2, 3, 4, 5};
int n = sizeof(array)/sizeof(array[0]);
for(int i = n – 1; i >= 0; i–)
{
cout << array[i] << " "; } return 0; } [/code]

## Understanding the Solution

In the above code snippet, we initialize an integer array containing five elements. We then calculate the size of the array by dividing the total size of the array by the size of one element.

The for loop initializes the counter variable ‘i’ from the end of the array (‘n-1’), then decrement ‘i’ after each iteration until it reaches zero. In each iteration, we print the current array element denoted by ‘array[i]’.

This approach results in the array being traversed and printed in the reverse order, achieving our objective.

## Key Concepts: Arrays & Looping in C++

Arrays are a crucial data structure in programming, storing multiple values of the same datatype. One can access any element by its index.

Loops in C++ are used for iterating over a block of code multiple times. The ‘for’ loop initializes the iterator, tests the loop continuation condition, and increments (or decrements) the iterator in one line, offering exceptional readability and control.

## Related Libraries and Functions

To further your understanding of these concepts, it may be beneficial to study the standard template library (STL) in C++. It includes powerful tools such as vectors that are safer and more flexible than traditional arrays.

Also, you might want to look into iterator libraries as well. Instead of manually indexing your way through arrays or other container types, iterators can make the task much easier and more intuitive.

Remember:

• Loop operations must be handled carefully to avoid logical errors and crashes.
• Always consider the ‘size – 1’ index for the last element while backtracking the loop through the array.
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