Objective: write a program that provides a custom handler for the interrupt signal.

What to do?

Write a C program prime that uses a brute force approach to find prime numbers.

prime needs to keep track of the largest prime number found so far.

Use the signal() function to provide a custom handler for the SIGINT signal.

When Ctrl-C is pressed, prime needs to do the following:

Print the largest prime number found so far;

Prompt the user whether to quit;

Accept exactly one character as the input without requiring the user to press Enter;

Quit if the user presses y or Y.

Typical output generated by prime will look as follows:

$ prime 17 Quit [y/n]? n 271 Quit [y/n]? z 521 Quit [y/n]? N 1061 Quit [y/n]? n 1783 Quit [y/n]? y $