Interactive Integer problem generator for kids

int_prob_gen.jl

function int_prob_gen(n)
    starting_time=time()
    s=0 #successes 
    pm(x)=x>0? "+":""
    for i=1:n
        x=rand(-10:10)
        y=rand(-10:10)
        op=rand(["+","-"])
        right_ans="($x)$op($y)"|>parse|>eval
        parse_correct=false
        while !parse_correct
            print("($(pm(x))$x) $op ($(pm(y))$y) = ")
            answer_string=readline(STDIN)
            answer=typemax(Int)
            try 
                answer=parse(Int,answer_string)
            catch
                println("Invalid Input! Please try again")
                continue
            end
            parse_correct=true
            if answer==right_ans
                s+=1
                println(rand(["Nice going!","Good Job","You are doing Great","Fantastic","You Rock!"]))
            else
                println("The correct answer was $right_ans, but you entered $answer.\nBetter luck next time!")
            end 
        end
    end
    println("You got $s out of $n correct!")
    elapsed_time=time()-starting_time
    mins=div(elapsed_time,60)|>Int
    secs=round(Int, elapsed_time%60) 
    println("It took $mins minutes and $secs to complete the exercise")
end

#Main 
int_prob_gen(10)