Question

C++ Program Help
Prompt your user to enter a length of a word to search from a string. Use forking to spawn a child process to perform the counting task. Allow the child process to finish and output the number of words found (if any), before prompting the user for the next length. Count all words in the string with this length and output the number of words that correspond to this length. Program keeps asking user for length till user enters "0" which terminates the program

EXAMPLE:
String: Hello I am posting on Chegg Study!

Output:
Enter word length : 5
Count: 3
Enter word length : 2
Count: 2
Enter word length : 0
Program ended

Answer 1

// do comment if any problem arises

// code

#include <iostream>

#include <sys/wait.h>

#include <unistd.h>

using namespace std;

int main()

{

    // string to search for

    string temp = "Hello I am posting on Chegg Study!";

    while (true)

    {

        cout << "Enter word length: ";

        int length;

        // read length of word to search

        cin >> length;

        // exit condition

        if (length == 0)

            break;

        // fork a child

        if (fork() == 0)

        {

            // count is number of matches found

            int count = 0;

            // current length of current word while traversing string

            int current = 0;

            for (int i = 0; i < temp.length() + 1; i++)

            {

                // space or end of string

                if (temp[i] == ' ' || temp[i] == '\0')

                {

                    if (current == length)

                        count++;

                    current = 0;

                }

                else

                {

                    // ignore punctuations

                    if (temp[i] == ',' || temp[i] == '.' || temp[i] == '!')

                        continue;

                    else

                        current++;

                }

            }

            cout << "Count: " << count << endl;

            exit(0);

        }

        else

        {

            wait(NULL);

        }

    }

    cout << "Program ended\n";

}

Output:

Enter word length: 5 Count: 3 Enter word length: 2 Count: 2 Enter word length: 0 Program ended