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String* x; int main () { } p(); q(); int p() { ... X new String[10]; int q () { } delete x

String* x; int main () { } p(); q(); int p() { ... X new String[10]; int q () { } delete x

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 help me understand this question better? Please give a clear and detailed answer, and if possible, break it down into parts to make it easier for me to grasp.

 

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When does lifetime of heap allocated objects begin and end?

```cpp String* x; int main () { p(); q(); } int p() { ... x = new String[10]; ... } int q() { ... delete x; ... } ``` In this code snippet, we see three main sections: 1. **Declaration**: `String* x;` - This declares a pointer `x` of type `String`. 2. **Function `p()`**: - The function `p()` is responsible for dynamically allocating an array of 10 `String` objects and assigning it to pointer `x`. 3. **Function `q()`**: - The function `q()` deletes the memory allocated to `x`, freeing up the resources. This snippet demonstrates basic dynamic memory allocation and deallocation using pointers in a programming language. Note that error handling and safe use practices are not shown; this is a basic illustrative example.
Transcribed Image Text:```cpp String* x; int main () { p(); q(); } int p() { ... x = new String[10]; ... } int q() { ... delete x; ... } ``` In this code snippet, we see three main sections: 1. **Declaration**: `String* x;` - This declares a pointer `x` of type `String`. 2. **Function `p()`**: - The function `p()` is responsible for dynamically allocating an array of 10 `String` objects and assigning it to pointer `x`. 3. **Function `q()`**: - The function `q()` deletes the memory allocated to `x`, freeing up the resources. This snippet demonstrates basic dynamic memory allocation and deallocation using pointers in a programming language. Note that error handling and safe use practices are not shown; this is a basic illustrative example.
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