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Programming Methodology

Count Words in a Text File Using C++

In this exercise, you will write a C++ program that reads a text file and counts the total number of words contained in it. This task will help you become familiar with file input operations using the `ifstream` class and manipulating strings with the `stringstream` class. You will learn how to process a file line by line and tokenize each line to count words individually. This exercise is useful for building tools such as basic text analyzers or utilities that process textual data.

Group

File Management in C++

Objective

1. Open an existing text file for reading using `ifstream`.
2. Read the file line by line.
3. For each line, use a `stringstream` to extract words.
4. Count the total number of words.
5. Display the total count on the screen.

Implement a program that counts the words in a text file.

Example C++ Exercise

 Copy C++ Code 
#include <iostream>       // Include for standard input and output
#include <fstream>        // Include for file input stream
#include <sstream>        // Include for stringstream
#include <string>         // Include for using the string class

using namespace std;

int main() {
    ifstream file("sample.txt");      // Open the file 'sample.txt' for reading
    string line;                      // Variable to hold each line from the file
    int wordCount = 0;                // Counter to track total number of words

    // Check if the file was opened successfully
    if (file.is_open()) {
        // Read the file line by line
        while (getline(file, line)) {
            stringstream ss(line);    // Create a stringstream for the current line
            string word;              // Variable to store individual words

            // Extract words from the line
            while (ss >> word) {
                wordCount++;          // Increment the word counter for each word
            }
        }

        file.close();  // Close the file after reading

        // Output the total number of words
        cout << "Total number of words in the file: " << wordCount << endl;
    } else {
        // Display error message if file couldn't be opened
        cout << "Error: Could not open file." << endl;
    }

    return 0;  // End of program
}

 Output

//Output Example:
Total number of words in the file: 42

//Content of sample.txt (for reference):
This is a sample text file.
It contains several lines of words.
The program should count them all correctly.

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