Output of this code? Put in necessary header files, please! const int MAX_ENTRIE

Question

Output of this code? Put in necessary header files, please!

const int MAX_ENTRIES = 20;

const int MAX_NAME_LEN = 40;

const int PHONE_LEN = 8;

struct PhoneEntry

{

char name[MAX_NAME_LEN + 1], phone[PHONE_LEN + 1];

};

struct PhoneBookType

{

int numPhones;

PhoneEntry phoneList[MAX_ENTRIES];

};

void ReadPhoneBook(PhoneBookType& APhoneBook);

void ReadEntry(PhoneEntry &entry);

void PrintMatches(const char number[], const PhoneBookType& APhoneBook);

void PrintEntry(const PhoneEntry &entry);

int main()

{

PhoneBookType MyPhoneBook;

char phoneNumber[PHONE_LEN + 1];

ReadPhoneBook(MyPhoneBook);

cout << endl;

cin >> phoneNumber;

while ( cin )

{

PrintMatches(phoneNumber, MyPhoneBook);

cout << endl;

cin >> phoneNumber;

}

return 0;

}

void ReadEntry(PhoneEntry &entry)

{

cin >> entry.phone;

cin >> entry.name;

}

void ReadPhoneBook(PhoneBookType& APhoneBook)

{

cout << "Number of entries in phone book: ";

cin >> APhoneBook.numPhones;

cout << "Enter items in the format " << endl;

for(int i = 0; i < APhoneBook.numPhones; i++)

ReadEntry(APhoneBook.phoneList[i]);

}

void PrintEntry(const PhoneEntry& entry)

{

cout << entry.name << ": " << entry.phone;

}

void PrintMatches(const char number[], const PhoneBookType& APhoneBook)

{

bool foundMatch = false;

cout << "Entries matching " << number << ":" << endl;

for(int i = 0; i < APhoneBook.numPhones; i++)

{

if ( strcmp(APhoneBook.phoneList[i].phone, number) == 0)

{

foundMatch = true;

PrintEntry(APhoneBook.phoneList[i]);

cout << endl;

}

}

if ( !foundMatch )

cout << "-- none" << endl;

}

Explanation / Answer

Hi! The output of this code will depend on how you execute it

Case 1

You execute the program and redirect the input stream to read from a file. If the contents of the file are as follows -

3
123456 Adam
123457 Bill
123458 Chad
123456
123457
123123
123458

First, the program asks for the number of entries which is 3
It then reads 3 entries in the form of <number> <name> (not that name cannot have spaces)
And then it reads each number following 3 entries and searches for those numbers in the address book

So the output for this case is

Number of entries in phone book: 3
Enter items in the format
123456 Adam
123457 Bill
123458 Chad

123456
Entries matching 123456:
Adam: 123456

123457
Entries matching 123457:
Bill: 123457

123123
Entries matching 123123:
-- none

123458
Entries matching 123458:
Chad: 123458

Case 2

In this case, the program won't terminate unless explicitly interrupted. It will keep waiting for phone numbers to search in the directory

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