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Various ways of Initializing an Array in C++

Hello Everyone!

In this tutorial, we will learn about the various ways of initializing an Array, in the C++ programming language.

To learn about the Array Container in STL, we will recommend you to visit:, where we have discussed it in detail.

The below given code in cpp programming language explains each of these in detail with the help of comments.


#include <iostream>
using namespace std;

int main()
    cout << "\n\nWelcome to Studytonight :-)\n\n\n";
    cout << " =====  Program to demonstrate various ways to Initialize an Array ===== \n\n";

    // No intitialization only declaration and hence, each of the array element contains a garbage value
    float arr[1000];

    //To initialize an array to all zeros, initialize only the first value to 0. All 1000 values automatically gets initialized to zero.
    float zeros[1000] = {0.0};

    //If the size is not mentioned, the compiler uses the number of values to be the size of the array
    int no_of_days[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    // Initial values of pressure(variable) undefined. Only declaration and hence all the elements store a garbage value initially.
    float pressure[10];

    // Only the initial elements contain the characters of the string. Remaining characters gets initialized to zero.
    char website_name[100] = "Studytonight";

    // Array size is 6 (last character is the String end delimeter '\0' ).
    char greeting[] = "Hello";

    return 0;

We hope that this post helped you develop better understanding of the various ways to initialize an array in C++. For any query, feel free to reach out to us via the comments section down below.

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About the author:
Nikita Pandey is a talented author and expert in programming languages such as C, C++, and Java. Her writing is informative, engaging, and offers practical insights and tips for programmers at all levels.