Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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```cpp Run the following program and make sure that you can explain the output, #include <iostream> using namespace std; int main() { int b[3][2]; cout << sizeof(b) << endl; // -> what will be printed on each line? 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: 1. `sizeof(b)`: Returns the total size of the 2D array `b`. Since `b` is a 3x2 array and assuming each `int` is 4 bytes, this would be `3 * 2 * 4 = 24` bytes. 2. `sizeof(b + 0)`: Returns the size of a pointer to the first element of `b`. This is typically the size of a pointer on the system (e.g., 8 bytes on a 64-bit system). 3. `sizeof(*(b + 0))`: Returns the size of the first sub-array of `b`, which is an array of 2 integers (2 * 4 = 8 bytes). 4. `" b is: " << b`: Prints the address of the first element of the array `b`. 5. `" b+1 is: " << b + 1`: Prints the address of the second row of `b`. Incrementing `b` skips over an entire row (2 integers). 6. `" &b is: " << &b`: Prints the address of the entire array `b`. 7. `" &b+1 is: " << &b + 1`: Prints the address one past the end of the entire array `b`. Incrementing `&b` skips over the whole 2D array, moving the pointer by `sizeof(b)` bytes.
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Transcribed Image Text:```cpp Run the following program and make sure that you can explain the output, #include <iostream> using namespace std; int main() { int b[3][2]; cout << sizeof(b) << endl; // -> what will be printed on each line? 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: 1. `sizeof(b)`: Returns the total size of the 2D array `b`. Since `b` is a 3x2 array and assuming each `int` is 4 bytes, this would be `3 * 2 * 4 = 24` bytes. 2. `sizeof(b + 0)`: Returns the size of a pointer to the first element of `b`. This is typically the size of a pointer on the system (e.g., 8 bytes on a 64-bit system). 3. `sizeof(*(b + 0))`: Returns the size of the first sub-array of `b`, which is an array of 2 integers (2 * 4 = 8 bytes). 4. `" b is: " << b`: Prints the address of the first element of the array `b`. 5. `" b+1 is: " << b + 1`: Prints the address of the second row of `b`. Incrementing `b` skips over an entire row (2 integers). 6. `" &b is: " << &b`: Prints the address of the entire array `b`. 7. `" &b+1 is: " << &b + 1`: Prints the address one past the end of the entire array `b`. Incrementing `&b` skips over the whole 2D array, moving the pointer by `sizeof(b)` bytes.
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