
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
![### What is the output of the following code snippet?
```cpp
int arr[5] = { 1, 2, 3, 4, 5 };
int* ptr = arr;
ptr = ptr + 2;
cout << *ptr << endl;
```
- ( ) There is no output due to a compilation error.
- ( ) 1
- ( ) 2
- (x) 3
### Explanation:
This code snippet is performing pointer arithmetic and array indexing in C++. Here is a step-by-step explanation:
1. **Array Declaration:** An integer array `arr` of size 5 is initialized with the values `{ 1, 2, 3, 4, 5 }`.
2. **Pointer Initialization:** A pointer `ptr` is declared and initialized to point to the first element of the array `arr`.
3. **Pointer Arithmetic:** The pointer is then incremented by 2, so `ptr` now points to the third element of the array.
4. **Dereferencing Pointer:** The value at the pointer (third element of the array) is printed using `cout`, which outputs `3`.](https://content.bartleby.com/qna-images/question/d8badeeb-990f-4af1-8fd1-eb21fafff42d/1e75d55b-3fff-417c-8533-9975c610a1c5/2rw6fuo_thumbnail.jpeg)
Transcribed Image Text:### What is the output of the following code snippet?
```cpp
int arr[5] = { 1, 2, 3, 4, 5 };
int* ptr = arr;
ptr = ptr + 2;
cout << *ptr << endl;
```
- ( ) There is no output due to a compilation error.
- ( ) 1
- ( ) 2
- (x) 3
### Explanation:
This code snippet is performing pointer arithmetic and array indexing in C++. Here is a step-by-step explanation:
1. **Array Declaration:** An integer array `arr` of size 5 is initialized with the values `{ 1, 2, 3, 4, 5 }`.
2. **Pointer Initialization:** A pointer `ptr` is declared and initialized to point to the first element of the array `arr`.
3. **Pointer Arithmetic:** The pointer is then incremented by 2, so `ptr` now points to the third element of the array.
4. **Dereferencing Pointer:** The value at the pointer (third element of the array) is printed using `cout`, which outputs `3`.
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