When a user program makes a system call to read or write a disk file, it provides an indication of which file it wants, a pointer to the data buffer, and the count. control is then transferred to the os, which calls the appropriate driver. suppose that the driver starts the disk and terminates until an interrupt occurs. in the case of reading from the disk, obviously the caller will have to be blocked (because there are no data for it). what about the case of writing to the disk? need the caller be blocked awaiting completion of the disk transfer? explain.

Write a program that begins by reading in a series of positive integers on a single line of input and then computes and prints the product of those integers. integers are accepted and multiplied until the user enters an integer less than 1. this final number is not part of the product. then, the program prints the product. if the first entered number is negative or 0, the program must print “bad input.” and terminate immediately. next, the program determines and prints the prime factorization of the product, listing the factors in increasing order. if a prime number is not a factor of the product, then it

Which type of entity describes a fundamental business aspect of a database? a. linking b. lookup c. domain d. weak

Which spreadsheet operation does a look function perform?