What will be the value of arr[2], the third element in the vector, after this code executes?#include using namespace std;int main() {const int n = 4;int arr[n];arr[e] = 3;arr[2] = arr[e];arr[e]++;134 Consider the stack trace below for a program that does not compile. Which is the best explanation for what is causing this error?main.cpp: In function 'int main()':main.cpp:27:29: error: ISO C++ forbids variable length array months' [-Wla]string months[num_months];months is not an arraynum_months has not been initializednum_months is a variablenum_months is a constant

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What will be the value of arr[2], the third element in the vector, after this code executes?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Operations of vector class

The vector class is available in Java and C++ programming languages. It is a class implementing a dynamic array. A dynamic array is an array whose size automatically increases when an element is added to it. The vector class stores elements in a contiguous memory block and assigns the memory to the elements whenever required during execution.

Question

What will be the value of arr[2], the third element in the vector, after this code executes?
#include <iostream>
using namespace std;
int main() {
const int n = 4;
int arr[n];
arr[e] = 3;
arr[2] = arr[e];
arr[e]++;
1
3
4

Consider the stack trace below for a program that does not compile. Which is the best explanation for what is causing this error?
main.cpp: In function 'int main()':
main.cpp:27:29: error: ISO C++ forbids variable length array months' [-Wla]
string months[num_months];
months is not an array
num_months has not been initialized
num_months is a variable
num_months is a constant

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