What is the output of this program? #include #include #include #include int main() { sem_t* sem_id; int value; sem_id = sem_open("new_13",O_CREAT,0666,3); if(sem_id == SEM_FAILED) perror("sem_open"); sem_wait(sem_id); sem_wait(sem_id); sem_wait(sem_id); sem_wait(sem_id); sem_post(sem_id); sem_post(sem_id); sem_getvalue(sem_id,&value); printf("%d\n",value); if(sem_close(sem_id) == -1) perror("sem_close"); return 0; } a) 2 b) 3 c) 0 d) none of the mentioned

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Concept of Pointer Parameter

Pointers are the special variable that stores the variable address, instead of storing the variable value. Pointer is a powerful feature of a programming language. A pointer is mostly used to save memory space and improve execution time.