#include 

int main() {
    printf("Hello, World!\n");
    return 0;
}

#include 

int main() {
    int a = 5;
    int b = 10;
    int c = a + b;
    printf("%d", c);
    return 0;
}

#include 

int main() {
    int arr[5] = {1, 2, 3, 4, 5};
    for(int i = 0; i < 5; i++) {
        printf("%d ", arr[i]);
    }
    return 0;
}

#include 
#include 

void *printHello(void *threadid) {
    printf("Hello from thread %d\n", threadid);
    pthread_exit(NULL);
}

int main() {
    pthread_t thread;
    int rc = pthread_create(&thread, NULL, printHello, (void *)1);
    if (rc) {
        printf("Error:unable to create thread, %d\n", rc);
        exit(-1);
    }
    pthread_exit(NULL);
    return 0;
}

#include 

struct Person {
    char name[50];
    int age;
};

int main() {
    struct Person person;
    strcpy(person.name, "John");
    person.age = 30;
    printf("%s is %d years old.", person.name, person.age);
    return 0;
}

#include 

int main() {
    int a = 5;
    int b = 10;
    int *p1 = &a;
    int *p2 = &b;
    *p1 = *p2;
    printf("a = %d, b = %d", a, b);
    return 0;
}