Calculator.cpp

#include <iostream>
#include <sys/ipc.h>
#include <sys/shm.h>

using namespace std;
int *SharedData;
pthread_mutex_t mutex;
void calculator() {
    cout << "------------------------------------------------------" << endl;
    int choice, num1, num2;
    do {
        cout << "1. Addition" << endl;
        cout << "2. Subtraction" << endl;
        cout << "3. Multiplication" << endl;
        cout << "4. Division" << endl;
        cout << "5. Exit" << endl;
        cout << "Enter choice: ";
        cin >> choice;

        switch (choice) {
            case 1:
            {
            pthread_mutex_lock(&mutex);
                cout << "Enter 1st Number: ";
                cin >> num1;
                cout << "Enter 2nd Number: ";
                cin >> num2;
                cout << "Addition of " << num1 << " and " << num2 << " = " << num1 + num2 << endl;
                pthread_mutex_unlock(&mutex);
                break;
                }
            case 2:
            {
            pthread_mutex_lock(&mutex);
                cout << "Enter 1st Number: ";
                cin >> num1;
                cout << "Enter 2nd Number: ";
                cin >> num2;
                cout << "Subtraction of " << num1 << " and " << num2 << " = " << num1 - num2 << endl;
                pthread_mutex_unlock(&mutex);
                break;
                }
                
            case 3:
            {
            pthread_mutex_lock(&mutex);
                cout << "Enter 1st Number: ";
                cin >> num1;
                cout << "Enter 2nd Number: ";
                cin >> num2;
                cout << "Multiplication of " << num1 << " and " << num2 << " = " << num1 * num2 << endl;
                pthread_mutex_unlock(&mutex);
                break;
                }
            case 4:
            {
            pthread_mutex_lock(&mutex);
                cout << "Enter 1st Number: ";
                cin >> num1;
                cout << "Enter 2nd Number: ";
                cin >> num2;
                if (num2 == 0) {
                    cout << "Cannot divide by zero" << endl;
                } else {
                    cout << "Division of " << num1 << " and " << num2 << " = " << num1 / num2 << endl;
                }
                pthread_mutex_unlock(&mutex);
                break;
                }
            case 5:
                cout << "Exiting!" << endl;
                break;
            default:
                cout << "Invalid Input!" << endl;
                break;
        }
        cout << "------------------------------------------------------" << endl;
    } while (choice != 5);
}

int main() {


    if (pthread_mutex_init(&mutex, NULL) != 0) {
        perror("Mutex initialization failed!");
        return 1;
    }
    
  int shmid = shmget((key_t)8749, sizeof(SharedData),IPC_CREAT | 0666);
    if (shmid == -1) {
        perror("Failed!");
        return 1;
    }

    // Attach the shared memory segment
 SharedData = (int*)shmat(shmid, NULL, 0);
    if (SharedData == (int*)(-1)) {
        perror("Failed!");
        return 1;
    }
    
    cout << "\n\tProcess Requirements:\n";
           cout << "\nProcess Requirements:\n";
    cout << "Memory: 500MB\n";
    cout << "Hard Disk Space: 200MB";
    cout << "Number of Cores: 1"<< endl;
    
  
    if(*SharedData<500)
    {
     cout << "\tInsufficient resources to create a new process." << endl;
            do{
  
               }while(*SharedData<500);
    }
   cout<<"Memory Allocation Done to This Process!\n";
   *SharedData-=500;
     //cout << "Memory: " << *SharedData << " MB\n";
    calculator();
    *SharedData+=500;
 
           pthread_mutex_destroy(&mutex);

    return 0;
}