Question

Write a program that keeps track of a speakers’ bureau. The program should use a structure to store the following data about a speaker: (this is in C++)
Name
Telephone Number
Speaking Topic
Fee Required

The program should use a vector of structures. It should let the user enter data into the vector, change the contents of any element, and display all the data stored in the vector. The program should have a menu-driven user interface.

Input Validation: When the data for a new speaker is entered, be sure the user enters data for all the fields and No negative amounts should be entered for a speaker’s fee.

In addition: add a function to the program that allows the user to search for a speaker on a particular topic. It should accept a key word as an argument then search the vector for a structure with that key word in the Speaking Topic field. All structures that match should be displayed. If no structure matches, a message saying so should be displayed.

Hint: use the .find() string function to search the Speaking Topic field.

Answer 1

C++ Program:

#include <iostream>
#include <vector>
#include <string>

using namespace std;

//Structure representing Speaker
struct Speaker
{
string name;
string telphoneNumber;
string topic;
double fee;
};

//Array of struct objects
vector<struct Speaker> speakersArr;

//Variable to hold number of speakers
int speakerCnt=0;

//Menu
int menu()
{
int ch;

//Printing menu
cout << " 1 - Add Speaker 2 - Edit Speaker 3 - Search Speaker 4 - Print All 5 - Exit Your Option: ";
cin >> ch;

return ch;
}

//Adding speaker
void addSpeaker()
{
struct Speaker temp;

//Reading info from user
cout << " Enter speaker name: ";
cin >> temp.name;

cout << " Enter Telephone Number: ";
cin >> temp.telphoneNumber;

cout << " Enter speaking topic: ";
cin >> temp.topic;

//Avoiding negative values
do
{
cout << " Enter fee: ";
cin >> temp.fee;
}while(temp.fee < 0);

//Adding to list
speakersArr.push_back(temp);

//Incrementing speaker count
speakerCnt += 1;
}

//Editing speaker
void editSpeaker()
{
string name;
int i, index=-1;

//Reading info from user
cout << " Enter speaker name: ";
cin >> name;

//Searching for speaker
for(i=0; i<speakerCnt; i++)
{
//Comparing names
if(strcmp(speakersArr.at(i).name.c_str(), name.c_str()) == 0)
{
//Updating index
index = i;
}
}

if(index == -1)
{
cout << " Speaker not found... ";
}
else
{
//Updating data
cout << " Enter Telephone Number: ";

cin >> (speakersArr.at(index)).telphoneNumber;

cout << " Enter speaking topic: ";
cin >> speakersArr.at(index).topic;

//Avoiding negative values
do
{
cout << " Enter fee: ";
cin >> speakersArr.at(index).fee;
}while(speakersArr.at(index).fee < 0);

cout << " Updated Successfully.... ";
}
}

//Printing speaker
void searchSpeaker()
{
string topicS;
int i, index=-1;

//Reading info from user
cout << " Enter speaking topic: ";
cin >> topicS;

//Searching for speaker
for(i=0; i<speakerCnt; i++)
{
//Comparing names
if((speakersArr.at(i).topic).find(topicS) == 0)
{
//Printing data
cout << " Name: " << speakersArr.at(i).name;
cout << " Telephone Number: " << speakersArr.at(i).telphoneNumber;
cout << " Speaking topic: " << speakersArr.at(i).topic;
cout << " Fee: " << speakersArr.at(i).fee;
}
}
}

//Printing all speaker's
void printAll()
{
int i;

//Searching for speaker
for(i=0; i<speakerCnt; i++)
{
//Printing data
cout << " Speaker Name: " << speakersArr.at(i).name;
cout << " Telephone Number: " << speakersArr.at(i).telphoneNumber;
cout << " Speaking topic: " << speakersArr.at(i).topic;
cout << " Fee: " << speakersArr.at(i).fee << " ";
}
}

//Main function
int main()
{
int option;

while(1)
{
//Printing menu
option = menu();

//Calling appropriate function
switch(option)
{
case 1: addSpeaker(); break;
case 2: editSpeaker(); break;
case 3: searchSpeaker(); break;
case 4: printAll(); break;
case 5: exit(0);
default: cout << " Invalid option... "; break;
}
}

cout << " ";
return 0;
}

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Sample Run: