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#include <iostream>
#include <iomanip>
#include <ctype.h>

using namespace std;

int WordLength();
void DisplayTable(int WF[]);

int main()
{
    int WordFrequency[16]={0};
    int TempLengthStorage=0;

TempLengthStorage=WordLength();

while (TempLengthStorage!=0)
    {
        if (TempLengthStorage==1)//skipping subscript 0 - not using it
            ++WordFrequency[1];

else if (TempLengthStorage==2)
            ++WordFrequency[2];

else if (TempLengthStorage==3)
            ++WordFrequency[3];

else if (TempLengthStorage==4)
            ++WordFrequency[4];

else if (TempLengthStorage==5)
            ++WordFrequency[5];

else if (TempLengthStorage==6)
            ++WordFrequency[6];

else if (TempLengthStorage==7)
            ++WordFrequency[7];

else if (TempLengthStorage==8)
            ++WordFrequency[8];

else if (TempLengthStorage==9)
            ++WordFrequency[9];

else if (TempLengthStorage==10)
            ++WordFrequency[10];

else if (TempLengthStorage==11)
            ++WordFrequency[11];

else if (TempLengthStorage==12)
            ++WordFrequency[12];

else if (TempLengthStorage==13)
            ++WordFrequency[13];

else if (TempLengthStorage==14)
            ++WordFrequency[14];

else if (TempLengthStorage>=15)
            ++WordFrequency[15];

TempLengthStorage=WordLength();
    }

DisplayTable(WordFrequency);
}

int WordLength()
{
    int LetterCount=0;
    int EndOfWord=0;
    char Input;
    char NextChar;

cin.get(Input);

while (EndOfWord!=1 && !cin.eof())
    {
        if (Input==' ' || Input=='\n' || Input=='.' || Input=='!' || Input=='?'  || Input==',')
        {//do nothing if whitespace or punctuation, essentially skips over them
        }

else if (Input=='-')
        {
            NextChar=cin.peek();

if ((isalpha(NextChar)) || (isdigit(NextChar)))//this includes the hyphen in words that have hyphens (refer to funtion notes)
                ++LetterCount;

if (NextChar=='\n')//for cases where the hyphen doesn't add to word length (refer to function notes)
            {
                cin.get(Input);//dont count it and get next character
            }
        }

else if (Input=='\'')
            ++LetterCount;

else if ((isalpha(Input)) || (isdigit(Input)))
        {
            ++LetterCount;

NextChar=cin.peek();

if (NextChar==' ' || NextChar=='\n' || NextChar=='.' || NextChar=='!' || NextChar=='?'  || NextChar==',' || NextChar==')')//included ) as a condition to end words for cases such as (219)
            {
                EndOfWord=1;
            }
        }

cin.get(Input);
    }

return LetterCount;
}

void DisplayTable(int WF[])
{
    int TotalWords=0;
    float TotalLetters=0;//made a float for float based masth later on when finding average
    float Average=0;

cout << endl;

cout << "Word Length                 Frequency" << endl;
    cout << "-----------                 ---------" << endl;

for (int i=1; i<=15; ++i)
    {
        /*This portion of the loop displays the table*/

cout << "    ";
        cout << setw(2) << i;
        cout << "                          ";
        cout << WF[i] << endl;

/*this portion of the loop does the calculations needed to find the average word length*/

TotalWords += WF[i];
        TotalLetters += (i * WF[i]);
    }

cout << "\nTotal Words = " << TotalWords << endl << endl;

cout << "Total Letters = " << TotalLetters << endl << endl;

Average = TotalLetters/TotalWords;

cout << "Average Word Length: " << Average << endl;
}

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Compilation time: 1.5 sec, absolute running time: 0.32 sec, absolute service time: 1.86 sec