calc

while true do
term.clear()
term.setCursorPos(1,1)
print("Type any simple equation. Type \"exit\" to exit. ")
res = ""
equ = read()
equs = {}
if equ == "exit" then return end
for i in string.gmatch(equ, "[^%s]+") do
equs[#equs + 1] = i
end
if tonumber(equs[1]) == nil or tonumber(equs[3]) == nil then
res = "Values are not numbers"
else
if equs[2] == "+" then
res = tonumber(equs[1]) + tonumber(equs[3])
elseif equs[2] == "-" then
res = tonumber(equs[1]) - tonumber(equs[3])
elseif equs[2] == "*" then
res = tonumber(equs[1]) * tonumber(equs[3])
elseif equs[2] == "/" then
res = tonumber(equs[1]) / tonumber(equs[3])
else
res = "Invalid Operator"
end
end

print(res)
print("Any key to continue")
os.pullEvent()
end