Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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![### Understanding Map Data Structures in C++
In this section, we will explore how to define a type of map that stores the ID numbers of a collection of students. The ID numbers are stored as integers, and the names of the students are used as keys and stored as strings. We will also look at how to use a type alias (`using`) or a `typedef` to give this type of map the name `IDMap`.
#### (a) Defining a Map for Student ID Numbers
To define a type of map for storing the ID numbers of students, where the keys are student names and the values are their ID numbers, follow these steps:
1. **Use of `map`**: In C++, a `map` is a data structure that allows you to store key-value pairs. The keys in our map will be the names of the students (strings), and the values will be their ID numbers (integers).
2. **Type Alias or `typedef`**: We can use either a type alias with the `using` keyword or a `typedef` to give a meaningful name to our map, such as `IDMap`.
Here is an example using both methods:
```cpp
#include <iostream>
#include <map>
#include <string>
// Using type alias (using)
using IDMap = std::map<std::string, int>;
// Using typedef
typedef std::map<std::string, int> IDMapTypedef;
int main() {
// Creating a map using the type alias
IDMap studentIDs;
studentIDs["John"] = 12345;
studentIDs["Alice"] = 67890;
// Creating a map using typedef
IDMapTypedef studentIDsTypedef;
studentIDsTypedef["Bob"] = 54321;
studentIDsTypedef["Eve"] = 98765;
// Accessing the ID of a student using the key (name)
std::cout << "John's ID: " << studentIDs["John"] << std::endl;
std::cout << "Alice's ID: " << studentIDs["Alice"] << std::endl;
std::cout << "Bob's ID: " << studentIDsTypedef["Bob"] << std::endl;
std::cout << "Eve's ID: " << studentIDsTypedef["Eve"] << std::endl;
return 0;
}
```
In](https://content.bartleby.com/qna-images/question/a4aac48a-4d20-41e4-aba5-4ec9a336b2fd/dcb6cfbf-f62d-4989-a2dc-378ec4a264ec/buv07j5_processed.png)
Transcribed Image Text:### Understanding Map Data Structures in C++
In this section, we will explore how to define a type of map that stores the ID numbers of a collection of students. The ID numbers are stored as integers, and the names of the students are used as keys and stored as strings. We will also look at how to use a type alias (`using`) or a `typedef` to give this type of map the name `IDMap`.
#### (a) Defining a Map for Student ID Numbers
To define a type of map for storing the ID numbers of students, where the keys are student names and the values are their ID numbers, follow these steps:
1. **Use of `map`**: In C++, a `map` is a data structure that allows you to store key-value pairs. The keys in our map will be the names of the students (strings), and the values will be their ID numbers (integers).
2. **Type Alias or `typedef`**: We can use either a type alias with the `using` keyword or a `typedef` to give a meaningful name to our map, such as `IDMap`.
Here is an example using both methods:
```cpp
#include <iostream>
#include <map>
#include <string>
// Using type alias (using)
using IDMap = std::map<std::string, int>;
// Using typedef
typedef std::map<std::string, int> IDMapTypedef;
int main() {
// Creating a map using the type alias
IDMap studentIDs;
studentIDs["John"] = 12345;
studentIDs["Alice"] = 67890;
// Creating a map using typedef
IDMapTypedef studentIDsTypedef;
studentIDsTypedef["Bob"] = 54321;
studentIDsTypedef["Eve"] = 98765;
// Accessing the ID of a student using the key (name)
std::cout << "John's ID: " << studentIDs["John"] << std::endl;
std::cout << "Alice's ID: " << studentIDs["Alice"] << std::endl;
std::cout << "Bob's ID: " << studentIDsTypedef["Bob"] << std::endl;
std::cout << "Eve's ID: " << studentIDsTypedef["Eve"] << std::endl;
return 0;
}
```
In
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