$//$ Function to ask a question

bool ask$\_$question$($int max$\_$num$)\{$

int num$1=$ generate$\_$number$($max$\_$num$)$;

int num$2=$ generate$\_$number$($max$\_$num$)$;

int answer, user$\_$answer;

printf$("$What is $\%$d $+\%$d$?",$ num$1,$ num$2)$;

scanf$("\%$d$",$ &user$\_$answer$)$;

answer $=$ num$1+$ num$2$;

if $($user$\_$answer $==$ answer$)\{$

printf$("$Correct$!$

$")$;

return true;

$\}$ else $\{$

printf$("$Incorrect$!$

$")$;

return false;

$\}$

$\}$

int main$()\{$

srand$($time$($NULL$))$; $//$ Initialize random seed

int difficulty, lives, max$\_$num, questions, score $=0$;

printf$("$Welcome$!$

$")$;

printf$("$Select difficulty:

$")$;

printf$("1.$ Easy

$")$;

printf$("2.$ Medium

$")$;

printf$("3.$ Hard

$")$;

$//$ Prompt the user until a valid difficulty is selected

do $\{$

printf$("$Enter your choice $(1,2,$ or $3)$: $")$;

scanf$("\%$d$",$ &difficulty$)$;

$\}$ while $($difficulty $<1||$ difficulty $>3)$;

$//$ Set variables based on difficulty

switch $($difficulty$)\{$

case $1$:

lives $=3$;

max$\_$num $=10$;

questions $=5$;

break;

case $2$:

lives $=2$;

max$\_$num $=30$;

questions $=10$;

break;

case $3$:

lives $=1$;

max$\_$num $=60$;

questions $=15$;

break;

$\}$

$//$ Loop through questions

for $($int i $=0$; i $<$ questions; i$++)\{$

printf$("$Question $\%$d of $\%$d$.$ You have $\%$s remaining.

$",$ i $+1,$ questions, $($lives $==1)?"1$ life" : $"2$ lives"$)$;

$//$ Check if it's the challenge question

if $($i $==$ questions $-1)\{$

printf$("$Challenge question!

$")$;

if $(!$ask$\_$question$($max$\_$num $*2))\{$

lives $=0$;

break;

$\}$

$\}$ else $\{$

if $(!$ask$\_$question$($max$\_$num$))\{$

lives$--$;

if $($lives $==0)\{$

printf$("$Out of lives, game over!

$")$;

break;

$\}$

$\}$ else $\{$

score$++$;

$\}$

$\}$

$\}$

$//$ Calculate percentage

int percentage $=($score $*100)/$ questions;

$//$ Print test complete message

printf$("$Test complete!

$")$;

printf$("$You scored $\%$d$/\%$d $(\%$d$\%\%).$

$",$ score, questions, percentage$)$;

$//$ Print grade

if $($percentage $>=80)$

printf$("$Grade: High Distinction

$")$;

else if $($percentage $>=70)$

printf$("$Grade: Distinction

$")$;

else if $($percentage $>=60)$

printf$("$Grade: Credit

$")$;

else if $($percentage $>=50)$

printf$("$Grade: Pass

$")$;

else

printf$("$Grade: Fail

$")$;

return $0$;

$\}$