#include <iostream>     // For input and output
#include <unistd.h>    // For fork(), getpid(), getppid(), wait()
#include <cstdlib>      // For exit()
#include <sys/types.h> // For pid_t
#include <sys/wait.h>  // For wait()
 
using namespace std;
 
int main() {
    pid_t pid;  // Variable to store process ID
 
    cout << "Main Process Started. PID: " << getpid() << endl;
 
    // Creating a Child Process
    pid = fork();  // fork() creates a new child process
 
    if (pid < 0) {
        cerr << "Failed to create child process." << endl;
        return 1;  // Exit if fork fails
    }
 
    // Child Process Block
    else if (pid == 0) {
        cout << "Child Process Running..." << endl;
        cout << "Child PID: " << getpid() << ", Parent PID: " << getppid() << endl;
 
        // Do some task (simulation)
        cout << "Child Process Doing Some Work..." << endl;
        sleep(2); // Simulate work with a sleep
 
        // Process Deletion
        cout << "Child Process Completed. Deleting Itself Now..." << endl;
        exit(0);  // Child process terminates (gets deleted)
    }
 
    // Parent Process Block
    else {
        cout << "Parent Process Continues. PID: " << getpid() << endl;
        cout << "Child Process was created with PID: " << pid << endl;
 
        // Wait for the child process to finish
        wait(NULL); // Parent waits for the child to terminate
        cout << "Child Process has terminated. Parent Process Finished." << endl;
    }
 
    return 0;  // End of program
}

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