Authors:
Walter Savitch ,kenrick Mock
Chapter:
Streams And File Io
Exercise:
Programming Projects
Question:10 | ISBN:9780132846813 | Edition: 5
Question
Write a program that will compute the average word length (average number of characters per word) for a file that contains some text. A word is defined to be any string of symbols that is preceded and followed by one of the following at each end: a blank, a comma, a period, the beginning of a line, or the end of a line. Your program should define a function that is called with the input-file stream as an argument. This function should also work with the stream cin as the input stream, although the function will not be called with cin as an argument in this program. If this is being done as a class assignment, obtain the file names from your instructor.
Answer
PROGRAM CODE:
//Header section
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <iomanip>
using namespace std;
// Function to compute the average word length
double computeAverageWordLength(istream& input_stream)
{
// Variables to keep track of the total word length and word count
int total_length = 0;
int word_count = 0;
// Read each line from the input stream
string line;
while (getline(input_stream, line)) {
istringstream iss(line);
// Process each word in the line
string word;
while (iss >> word) {
// Count the characters in the word
total_length += word.length();
word_count++;
}
}
// Calculate the average word length
double average_length = static_cast<double>(total_length) / word_count;
return average_length;
}
int main() {
// Get the filename from the user
string filename;
cout << "Enter the filename: ";
cin >> filename;
// Open the input file stream
ifstream input_file(filename);
// Check if the file was opened successfully
if (!input_file) {
cerr << "Error: Unable to open the file." << endl;
return 1;
}
// Compute the average word length using the function
double average_word_length = computeAverageWordLength(input_file);
// Close the input file
input_file.close();
// Output the average word length with two decimal places
cout << "Average Word Length: " << fixed << setprecision(2) << average_word_length << endl;
return 0;
}
Data in input file(inFile.txt):
Twinkle, twinkle, little star
How I wonder what you are
Up above the world so high
Like a diamond in the sky
Twinkle, twinkle, little star
How I wonder what you are
When the blazing sun is gone
When he nothing shines upon
Then you show your little light
Twinkle, twinkle, all the night
Twinkle, twinkle, little star
How I wonder what you are
OUTPUT:
Enter the filename: inputFile.txt
Average Word Length: 4.34