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What is the lifetime of each variable? when does it begin? when does it end

What is the lifetime of each variable? when does it begin? when does it end

Database System Concepts
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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Can you answer this question for me because i don't understand it, can you please be every specfic with answer so i CAN understand it. Can you label each part.

 

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What is the lifetime of each variable? when does it begin? when does it end?

```cpp String* x; int main() { p(); q(); } int p() { ... x = new String[10]; ... } int q() { ... delete x; ... } ``` This set of code snippets illustrates a memory management process in C++ using dynamic allocation and deallocation of an array of `String` objects. The main elements of this code are: 1. **Declaration**: `String* x;` declares a pointer `x` to a `String` object. 2. **Function `p()`**: Allocates memory for an array of 10 `String` objects and assigns the memory to `x`. 3. **Function `q()`**: Deallocates the memory previously allocated to `x` using `delete`. Note that for deleting arrays allocated with `new`, you should use `delete[]`. This example demonstrates the importance of matching `new` with `delete[]` in dynamic memory management to avoid memory leaks and undefined behavior.
Transcribed Image Text:```cpp String* x; int main() { p(); q(); } int p() { ... x = new String[10]; ... } int q() { ... delete x; ... } ``` This set of code snippets illustrates a memory management process in C++ using dynamic allocation and deallocation of an array of `String` objects. The main elements of this code are: 1. **Declaration**: `String* x;` declares a pointer `x` to a `String` object. 2. **Function `p()`**: Allocates memory for an array of 10 `String` objects and assigns the memory to `x`. 3. **Function `q()`**: Deallocates the memory previously allocated to `x` using `delete`. Note that for deleting arrays allocated with `new`, you should use `delete[]`. This example demonstrates the importance of matching `new` with `delete[]` in dynamic memory management to avoid memory leaks and undefined behavior.
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