exp 5

#include <pthread.h>
#include <stdio.h>
#include <stdint.h>

#define num_threads 3

int je = 0, jo = 0, evensum = 0, oddsum = 0, evenarr[50], oddarr[50];
int sumnat = 0; // Declare sumnat as a global variable

void *even(void *threadid) {
    int i, n;
    n = (int)(intptr_t)threadid; // Cast to uintptr_t and then to int
    for (i = 1; i <= n; i++) { // Changed condition to i <= n
        if (i % 2 == 0) {
            evenarr[je] = i;
            evensum += i;
            je++;
        }
    }
    pthread_exit(NULL); // Exit the thread
}

void *odd(void *threadid) {
    int i, n;
    n = (int)(intptr_t)threadid; // Cast to uintptr_t and then to int
    for (i = 1; i <= n; i++) { // Changed condition to i <= n
        if (i % 2 != 0) { // Fixed condition to check odd numbers
            oddarr[jo] = i;
            oddsum += i;
            jo++;
        }
    }
    pthread_exit(NULL); // Exit the thread
}

void *sumn(void *threadid) {
    int i, n;
    n = (int)(intptr_t)threadid; // Cast to uintptr_t and then to int
    for (i = 1; i <= n; i++) { // Changed condition to i <= n
        sumnat += i;
    }
    pthread_exit(NULL); // Exit the thread
}

int main() {
    pthread_t threads[num_threads];
    int i, t;

    printf("Enter the n number: ");
    scanf("%d", &t);

    // Create threads
    pthread_create(&threads[0], NULL, even, (void *)(intptr_t)t);
    pthread_create(&threads[1], NULL, odd, (void *)(intptr_t)t);
    pthread_create(&threads[2], NULL, sumn, (void *)(intptr_t)t);

    // Join threads
    for (i = 0; i < num_threads; i++) {
        pthread_join(threads[i], NULL);
    }

    // Print results
    printf("The sum of n natural numbers is %d\n", sumnat);
    printf("The sum of n even numbers is %d\n", evensum);
    printf("The sum of n odd numbers is %d\n", oddsum);
    
    pthread_exit(NULL);
}