Question

Please note that this problem have to use sstream library in c++

(1) Prompt the user for a title for data. Output the title. (1 pt)

Ex:

Enter a title for the data:
Number of Novels Authored
You entered: Number of Novels Authored

(2) Prompt the user for the headers of two columns of a table. Output the column headers. (1 pt)

Ex:

Enter the column 1 header:
Author name
You entered: Author name

Enter the column 2 header:
Number of novels
You entered: Number of novels

(3) Prompt the user for data points. Data points must be in this format: string, int. Store the information before the comma into a string variable and the information after the comma into an integer. The user will enter -1 when they have finished entering data points. Output the data points. Store the string components of the data points in a vector of strings. Store the integer components of the data points in a vector of integers. (4 pts)

Ex:

Enter a data point (-1 to stop input):
Jane Austen, 6
Data string: Jane Austen
Data integer: 6

(4) Perform error checking for the data point entries. If any of the following errors occurs, output the appropriate error message and prompt again for a valid data point.

• If entry has no comma
  • Output: Error: No comma in string. (1 pt)
• If entry has more than one comma
  • Output: Error: Too many commas in input. (1 pt)
• If entry after the comma is not an integer
  • Output: Error: Comma not followed by an integer. (2 pts)

Ex:

Enter a data point (-1 to stop input):
Ernest Hemingway 9
Error: No comma in string.

Enter a data point (-1 to stop input):
Ernest, Hemingway, 9
Error: Too many commas in input.

Enter a data point (-1 to stop input):
Ernest Hemingway, nine
Error: Comma not followed by an integer.

Enter a data point (-1 to stop input):
Ernest Hemingway, 9
Data string: Ernest Hemingway
Data integer: 9

(5) Output the information in a formatted table. The title is right justified with a setw() value of 33. Column 1 has a setw() value of 20. Column 2 has a setw() value of 23. (3 pts)

Ex:

        Number of Novels Authored
Author name         |       Number of novels
--------------------------------------------
Jane Austen         |                      6
Charles Dickens     |                     20
Ernest Hemingway    |                      9
Jack Kerouac        |                     22
F. Scott Fitzgerald |                      8
Mary Shelley        |                      7
Charlotte Bronte    |                      5
Mark Twain          |                     11
Agatha Christie     |                     73
Ian Flemming        |                     14
J.K. Rowling        |                     14
Stephen King        |                     54
Oscar Wilde         |                      1

(6) Output the information as a formatted histogram. Each name is right justified with a setw() value of 20. (4 pts)

Ex:

         Jane Austen ******
     Charles Dickens ********************
    Ernest Hemingway *********
        Jack Kerouac **********************
 F. Scott Fitzgerald ********
        Mary Shelley *******
    Charlotte Bronte *****
          Mark Twain ***********
     Agatha Christie *************************************************************************
        Ian Flemming **************
        J.K. Rowling **************
        Stephen King ******************************************************
         Oscar Wilde *

Answer 1

#include <iostream>
#include <iomanip>
#include <sstream>
#include <cstdio>
#define MAX 50
using namespace std;

// Function to return number of comma available in the parameter string data
int countComma(string data)
{
// Counter to store number of comma
int counter = 0;
// Loops till end of the string
for(int c = 0; c < data.length(); c++)
// Checks if current character is a comma character
if(data.at(c) == ',')
// Increase the counter by one
counter++;
// Returns the counter
return counter;
}// End of function

// Function to return the index position of comma character
int getCommaPosition(string data)
{
// Loops till end of the string
for(int c = 0; c < data.length(); c++)
// Checks if current character is a comma character
if(data.at(c) == ',')
// Returns the loop variable value as found comma index position
return c;
}// End of function

// Function to accept valid author name and number of novels
// Returns the author name and number of novels by using pass by reference (&name and &num) respectively
// Returns true if data is valid otherwise returns false
bool validateData(string data, string &name, int &num)
{
// To store comma index position
int commaPosition;

// Calls the function to get number of commas
int comma = countComma(data);

// Checks if number of comma is equals to 0 then display error message
if(comma == 0)
{
cout<<"\n Error: No comma in string.";
return false;
}

// Otherwise Checks if number of comma is greater than 1 then display error message
else if(comma > 1)
{
cout<<"\n Error: Too many commas in input.";
return false;
}

// Otherwise valid name part
else
{
// Calls the function to get the comma position
commaPosition = getCommaPosition(data);

// Checks if the second position character after comma index position is a not digit
// displays error message
if(!isdigit(data[commaPosition + 2]))
{
cout<<"\n Error: Comma not followed by an integer.";
return false;
}

// Otherwise valid
else
{
// Extracts the name part from data
name = data.substr(0, commaPosition);
string n = data.substr(commaPosition + 2);

// Extracts number of novels from the data
stringstream number(n);
// Converts to integer
number>>num;

return true;
}// End of else
}// End of outer else
}// End of function

// Function to accept author name and number of novels till user not enters -1
void acceptData(string authorNames[], int numNovels[], int &counter)
{
// To store the data entered by the user
string data;
// To store author name
string name;
// To store number of novels
int num;

// Loops till user enters -1
do
{
fflush(stdin);
// Accepts data
cout<<"\n Enter a data point (-1 to stop input): ";
getline(cin, data);

// Checks if data is equals to -1 then stop the loop
if(data == "-1")
break;

// Otherwise
else
{
// Calls the function to validate data
// If valid then extracts the author name and number of novels
if(validateData(data, name, num))
{
// Stores the name at counter index position
authorNames[counter] = name;

// Stores the number of novels at counter index position
numNovels[counter] = num;

// Increase the counter by one
counter++;
}// End of if condition
}// End of else
}while(1);// End of do - while loop
}// End of function

// Function to display the data in tabular format
void showTabularFormat(string title, string heading1, string heading2,
string authorNames[], int numNovels[], int counter)
{
cout<<endl<<endl;
// Displays the title
cout<<setw(30)<<title<<endl;
// Displays the heading
cout<<left<<setw(20)<<heading1<<setw(4)<<" |"<<setw(20)<<heading2<<endl;

// Loops till number of authors
for(int c = 0; c < counter; c++)
// Displays the current author name and current number of novels
cout<<left<<" "<<setw(20)<<authorNames[c]<<setw(4)<<"|"<<setw(20)<<numNovels[c]<<endl;
}// End of function

// Function to display the data in histogram
void showHistogram(string authorNames[], int numNovels[], int counter)
{
cout<<"\n\n ************** Histogram ************** \n\n";

// Loops till number of authors
for(int c = 0; c < counter; c++)
{
// Display the current author name in right justified
cout<<right<<setw(20)<<authorNames[c]<<" ";

// Loops till current number of novels
for(int d = 0; d < numNovels[c]; d++)
// Displays "*" character
cout<<"*";
cout<<endl;
}// End of for loop
}// End of function

// main function definition
int main()
{
// To store title and headings
string title, heading1, heading2;
// To store author names
string authorNames[MAX];

// To store number of novels for each author
int numNovels[MAX];
// To store number of records
int counter = 0;

// Accepts title
cout<<"\n Enter a title for the data: ";
getline(cin, title);

// Accepts heading 1
cout<<"\n Enter the column 1 header:";
getline(cin, heading1);

// Accepts heading 1
cout<<"\n Enter the column 2 header:";
getline(cin, heading2);

fflush(stdin);
// Calls the function to accept data
acceptData(authorNames, numNovels, counter);

// Calls the function to display data in tabular format
showTabularFormat(title, heading1, heading2,authorNames, numNovels, counter);
// Calls the function to display data in histogram
showHistogram(authorNames, numNovels, counter);

return 0;
}// End of main function

Sample Output: