I wrote a program in C which crashed when it was run. The following text was copied and pasted directly from a shell window:

Program received signal SIGFPE, Arithmetic exception.

$0$x$000000000040114$f in zero$\_$int $($yr$1=2010,$ yr$2=2010,$ amt$=100000)$

at mortgage.c:$11$

$11$ return amt $/($yr$2-$ yr$1)$;

$($gdb$)$ list

$6$ #include

$7$ #include

$8$

$9$ double zero$\_$int$($int yr$1,$ int yr$2,$ int amt$)$

$10\{$

$11$ return amt $/($yr$2-$ yr$1)$;

$12\}$

$13$

$14$

$15/*$ the mortgage formula is from page $202$ of

$($gdb$)$

a$.$ What is the most likely reason the program stopped?

b$.$ What did the user $($person running the program$)$ most likely do wrong? How do you know?

c$.$ How should the program be changed to prevent this from happening again?$|$