function check_int(x)
    if x > 0
        println("$x is positive")
    elseif x < 0
        println("$x is negative")
    else
        println("$x is zero")
    end
end

check_int(10)
check_int(-10)
check_int(0)

for x in 1:5
    @show x
end

for x=1:5
    @show x
end

x = 0
while x < 5
    @show x
    x += 1
end
