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Working with map and ::iterator

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2025/2026 Written for academic year
Institution Santiago Canyon College
Course CMPR 131
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The provided code is a C++ program that manages a simple map of contacts with their associated names. Here's a breakdown of the key components: 1. **Includes and Namespace**: The program includes the necessary headers for input/output, string handling, and using maps from the Standard Template Library (STL). The `using namespace std;` statement allows accessing standard library features without needing to prefix them with `std::`. 2. **Main Function**: This is where the program execution begins. 3. **Map Declaration**: A `map` named `contactPerson` is declared, which uses `string` types for both keys (company names) and values (contact names). 4. **Populating the Map**: The map is populated with four entries where each company name is mapped to a fictional contact name, some of which play on jokes related to their brands (e.g., "E. Coli" for "Chipotle Mexican Grill"). 5. **Output Statements**: - It prints the contact name associated with "Takata Inc". - It displays the total number of contacts stored in the map using `contactP()`. 6. **Iterating Over the Map**: A `for` loop is used to iterate through each element in the `contactPerson` map. For each entry, it prints the company name and its associated contact. 7. **Checking for Existence**: Inside the loop, it checks if "Volkswagon of America" is in the map using `find()`. If the company is not found, it outputs a message; otherwise, it confirms its presence. However, the check is incorrectly placed inside the loop, so it will print the existence message for each contact. Overall, this program demonstrates basic map functionality in C++, including adding entries, retrieving values, iterating through the map, and checking for the existence of a key. The use of humorous names in the map values adds a light-hearted touch to the program.

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#include <iostream>
#include <string>
#include <map>
using namespace std;

int main()
{
map<string, string>contactPerson;

contactPerson["Volkswagon of America"] = "I.B. Cheaton";
contactPerson["Wallers Fargo Bank"] = "Ima Swindler";
contactPerson["Chipotle Mexican Grill"] = "E. Coli";
contactPerson["Takata Inc"] = "I. X. Plodum";

cout << "Takata Inc = " << contactPerson["Takata Inc"] << endl << endl;
cout << "# of contacts: " << contactPerson.size() << endl << endl;

for (map<string, string>::iterator it = contactPerson.begin(); it!=
contactPerson.end(); ++it)
{
cout << (*it).first << ":\t" << (*it).second << endl << endl;

if (contactPerson.find("Volkswagon of America") == contactPerson.end())
cout << "It's not in the map!" << endl << endl;
else
cout << "It's in the map" << endl << endl;
}
}
Connected book
image
Tony Gaddis Starting Out with C++ from Control Structures to Objects
Publisher: 2017 ISBN: 9780134498379 Edition: Unknown

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