Question

COSC 1437 C++ Project Assignment 2 Poll Summary Utilize a dynamic array of structure to summarize votes for a local election Specification: Write a program that keeps track the votes that each candidate received in a local election. The program should output each candidate’s name, the number of votes received, and the percentage of the total votes received by the candidate. Your program should also output the winner of the election. To solve this problem, you will use one dynamic array of structure to keep track the votes and candidate names. You will ask user for number of candidates and create one dynamic array of structure to keep track the votes for each candidate, and the names of each candidate. The programs will allow user to enter the last name of each candidate, and the number of votes each candidate received. The program should then output the summary of the voting result (see sample output below). You will design the necessary functions in your program to accomplish the tasks. File Name: FirstName_LastName_Poll.cpp The structure is defined as follows: struct Poll { string lastName; int votes; }; Functions in the program: Function name Return type Parameter list and purpose getSize int ()->parameter list is empty Prompt user to enter total number of candidates and return the size (size cannot be negative). makePollArray Poll* (int size)->parameter list Create a dynamic array of Poll and return a pointer to the array of Poll. getPollInfo void (Poll *poll, int size)->parameter list Prompt users to enter candidate last name and votes for all candidates (votes cannot be negative) calcMaxIndex int (Poll *poll, int size)->parameter list Return the array index which contains the most votes among candidates. (Assume no two candidates receive the same votes) calcTotalVotes int (Poll *poll, int size)->parameter list Return total votes for all candidates displayResults void (Poll *poll, int size)->parameter list Display each candidate with their votes, percentage to the total cotes, total votes and the winner of the election. See sample output Assignment Instructions: 1. Create a Visual Studio or Xcode project (Mac user) and name it ProjectAssignment2. 2. Add a cpp file and name it FirstName_LastName_Poll.cpp. This file contains all the functions above. COSC 1437 C++ Project Assignment 2 Poll Summary 3. In your main function, call getSize(), makePollArray(), getPollInfo(), and displayResults() functions. In displayResults() function, call calcTotalVotes() and calcMaxIndex() functions. 4. Use the sample output data to test your code. 5. You can create extra functions to enhance your program. 6. Name your variables clearly. 7. Add comments to document your project and code. 8. Add space/indentation to make your code easier to read. 9. Submit your cpp file and a screen shot of your output in Canvas for grading. Sample Program Output: Candidate Votes Received % of Total Votes Miller 5000 25.91 Johnson 4000 20.73 Robinson 6000 31.09 Smith 2500 12.95 Jones 1800 9.33 Total 19300 The winner of the Election is Robinson.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

#include<iostream>

#include<iomanip>

using namespace std;

struct Poll { string lastName; int votes; };

//method to get a valid number of candidates from user

int getSize(){

                int n;

                //prompting and reading size

                cout<<"Enter total number of candidates: ";

                cin>>n;

                //validating

                if(n>0){

                                //valid, returning it

                                return n;

                }

                //otherwise, invalid, displaying error message

                cout<<"Sorry, please enter a valid size"<<endl;

                //asking again and returning it (simple recursion)

                return getSize();

}

//method to create a Poll array dynamically and return it

Poll * makePollArray(int size){

                Poll* polls=new Poll[size];

                return polls;

}

//method to read data for all candidates and fill the poll array

void getPollInfo(Poll *poll, int size){

                string name;

                int votes;

                int i=0;

                //looping and reading data

                while(i<size){

                                cout<<"Enter last name of candidate: ";

                                cin>>name;

                                cout<<"Enter number of votes received by "<<name<<": ";

                                cin>>votes;

                                //validating votes

                                if(votes>=0){

                                               //valid, assigning to current poll element

                                               poll[i].lastName=name;

                                               poll[i].votes=votes;

                                               //moving to next candidate

                                               i++;

                                }else{

                                               //error, asking to try again

                                               cout<<"Error! number of votes cant be negative. Try again"<<endl;

                                }

                }

}

//returns the index of candidate with maximum votes

int calcMaxIndex (Poll *poll, int size){

                int max=-1;

                for(int i=0;i<size;i++){

                                //if max is still -1 or current person has more votes, then updating max

                                if(max==-1 || poll[i].votes > poll[max].votes){

                                               max=i;

                                }

                }

                return max;

}

//sums and returns the total number of votes

int calcTotalVotes (Poll *poll, int size){

                int sum=0;

                //looping and summing votes

                for(int i=0;i<size;i++){

                                sum+=poll[i].votes;

                }

                return sum;

}

//method to display results

void displayResults (Poll *poll, int size){

                //finding total

                int total=calcTotalVotes(poll,size);

                double percent;

                //aligning output to left, using a fixed precision of 2 digits

                cout<<left<<setprecision(2)<<fixed;

                //displaying heading

                cout<<endl<<setw(15)<<"Candidate"<<setw(15)<<"Votes Received"<<"% of total votes"<<endl;

                //looping and displaying details of all candidates

                for(int i=0;i<size;i++){

                                //finding percentage

                                percent=(double)poll[i].votes/total;

                                percent*=100;

                                //displaying name, vote and percentage

                                cout<<setw(15)<<poll[i].lastName<<setw(15)<<poll[i].votes<<percent<<endl;

                }

                //displaying total and final winner

                cout<<"Total "<<total<<endl;

                cout<<"The winner of the Election is "<<poll[calcMaxIndex(poll,size)].lastName<<endl;

}

int main(){

                //reading size

                int size=getSize();

                //creating dynamic array

                Poll* p=makePollArray(size);

                //reading input

                getPollInfo(p,size);

                //displaying results

                displayResults(p,size);

                //de allocating memory

                delete[] p;

                return 0;

}

/*OUTPUT*/

Enter total number of candidates: 4 Enter last name of candidate: James Enter number of votes received by James: 4000 Enter last name of candidate: 0liver Enter number of votes received by Oliver: 4356 Enter last name of candidate: Barry Enter number of votes received by Barry: 1789 Enter last name of candidate: Kara Enter number of votes received by Kara: 2350 Votes Received % of total votes Candidate James 4000 32.01 0liver 4356 34.86 Barry 1789 14.32 Kara 2350 18.81 Total 12495 The winner of the Election is Oliver