# Solved: fill array with 0

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In this article, we’re discussing a common problem facing developers using the C++ programming language: how to fill an array with zeroes. It’s one of those tasks that seem elementary, yet it’s essential to understand how to execute it properly to maintain optimal code functionality. In C++, there are several methods to fill an array with 0, and we’ll analyze these methods in depth to comprehend their effects on the execution of your code.

In C++, arrays are data structures consisting of elements of the same type, stored contiguously in memory. One of the primary characteristics of arrays in C++ is that they have a fixed size. This fixed-size characteristic often gives rise to situations where we need to initialize or fill an array with a specific value, like 0.

## Solution to the Problem

#include
#include
int main() {
int arr;
std::fill_n(arr, 5, 0);
for(int i = 0; i<5; i++) { std::cout << arr[i] << " "; } return 0; } [/code] This code fills an int array with zeroes using the std::fill_n function.

## Step-by-step Explanation of The Code

Initially, an int array arr of size 5 is declared. We then use the std::fill_n function to fill the array with zeroes. The fill_n function belongs to the algorithm library which comes standard with C++. The algorithm header defines functions for a variety of purposes (e.g., searching, sorting, manipulating) which we can use on ranges of elements. In this case, fill_n is used to fill a range of elements with a value – in this case, zero.

The fill_n function takes in three arguments – the first being the starting address of the array, the second being the size of the array, and the third being the value with which to fill it. In this snippet, we are telling it to start at the beginning of the array arr, to fill 5 elements, and to fill it with zero.

## Library Involved: Algorithm

This algorithm library is a part of the standard C++ library and hosts a set of functions that are mainly used to perform operations on arrays and other data structures. The presence of such a library greatly simplifies many coding tasks, freeing the developer from manually writing numerous lines of code, and thereby improving efficiency and readability.

## Another Method to Fill Array with Zero

There are other methods too, like using a loop to manually set each element to zero.

int main() {
int arr;
for(int i = 0; i<5; i++) { arr[i] = 0; } return 0; } [/code] In this approach, we have explicitly looped over each element of the array and set its value to 0. Although a bit lengthy, it is easier to understand for beginners. But clearly, the method using std::fill_n and the algorithm library is much more efficient and preferred.

## Difference Between Two Methods

While the end result seems the same, the two methods differ in their implementation. The first method using std::fill_n is faster and more efficient because it uses specialized algorithms to fill the array with 0. The second method is straightforward and easy to understand, but it’s slower since it manually assigns the value 0 to each element of the array.

By understanding the various ways to fill arrays with 0 in C++, one can increase code efficiency and readability. Remember the importance of using libraries, as they allow for cleaner and more concise code, leading to overall better performance.

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