1 #include using namespace std; 4 5 typedef char box[4][8]; 7 int main() { box b[3][2]; cout<
1 #include using namespace std; 4 5 typedef char box[4][8]; 7 int main() { box b[3][2]; cout<
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
Related questions
Question
What do lines 10-16 output?
![```cpp
#include <iostream>
using namespace std;
typedef char box[4][8];
int main()
{
box b[3][2];
cout << sizeof(b) << endl;
cout << sizeof(b+0) << endl;
cout << sizeof(*(b+0)) << endl;
cout << "b is: " << b << endl;
cout << "b+1 is: " << b+1 << endl;
cout << "&b is: " << &b << endl;
cout << "&b+1 is: " << &b+1 << endl;
return 0;
}
```
### Explanation
This C++ program demonstrates the use of multidimensional arrays and pointers. Here's a breakdown of its components:
1. **Typedef Definition**:
- `typedef char box[4][8];` creates an alias `box` for a 2D array of `char` with dimensions 4x8.
2. **Main Function**:
- `box b[3][2];` declares a 3x2 array of type `box`. This results in an actual array of dimensions 3x2x4x8.
3. **Size Calculations**:
- `sizeof(b)`: Calculates the total size of the array `b`.
- `sizeof(b+0)`: Calculates the size of a pointer to the beginning of the array.
- `sizeof(*(b+0))`: Calculates the size of the first "box" (4x8 array of chars).
4. **Pointer Arithmetic**:
- `b` and `b+1`: Shows the base address of `b` and the address after the first "row" (box) increment.
- `&b` and `&b+1`: Shows the address of the entire 3x2 array `b` and one increment beyond it.
This program helps in understanding how arrays and pointers relate to memory addresses and sizes in C++.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff5bb9956-2539-4c8d-9ee9-02ed0be838be%2F3732da04-cd06-44da-bced-2b944e27b294%2F43czce_processed.png&w=3840&q=75)
Transcribed Image Text:```cpp
#include <iostream>
using namespace std;
typedef char box[4][8];
int main()
{
box b[3][2];
cout << sizeof(b) << endl;
cout << sizeof(b+0) << endl;
cout << sizeof(*(b+0)) << endl;
cout << "b is: " << b << endl;
cout << "b+1 is: " << b+1 << endl;
cout << "&b is: " << &b << endl;
cout << "&b+1 is: " << &b+1 << endl;
return 0;
}
```
### Explanation
This C++ program demonstrates the use of multidimensional arrays and pointers. Here's a breakdown of its components:
1. **Typedef Definition**:
- `typedef char box[4][8];` creates an alias `box` for a 2D array of `char` with dimensions 4x8.
2. **Main Function**:
- `box b[3][2];` declares a 3x2 array of type `box`. This results in an actual array of dimensions 3x2x4x8.
3. **Size Calculations**:
- `sizeof(b)`: Calculates the total size of the array `b`.
- `sizeof(b+0)`: Calculates the size of a pointer to the beginning of the array.
- `sizeof(*(b+0))`: Calculates the size of the first "box" (4x8 array of chars).
4. **Pointer Arithmetic**:
- `b` and `b+1`: Shows the base address of `b` and the address after the first "row" (box) increment.
- `&b` and `&b+1`: Shows the address of the entire 3x2 array `b` and one increment beyond it.
This program helps in understanding how arrays and pointers relate to memory addresses and sizes in C++.
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