Calculator

Rukerisu

Jun 9th, 2025 (edited)

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-- Calculator
local mainMenu = {
"Calculations",
"View History",
"Shutdown"
}
local mathMenu = {
"Addition",
"Subtraction",
"Multiplication",
"Division",
"Power",
"Square Root",
"Back"
}
local history = {}
local function drawMenu(title, options, selected)
term.clear()
term.setCursorPos(1,1)
term.setTextColor(colors.blue)
print("=== " .. title .. " ===")
term.setTextColor(colors.white)
print("Use UP/DOWN arrows and Enter to select.\n")
for i, option in ipairs(options) do
if i == selected then
term.setTextColor(colors.yellow)
print("> " .. option)
term.setTextColor(colors.white)
else
print(" " .. option)
end
end
end
local function readNumber(prompt)
while true do
write(prompt)
local input = read()
local num = tonumber(input)
if num then return num end
term.setTextColor(colors.red)
print("Invalid input, please enter a number.")
term.setTextColor(colors.white)
end
end
local function showHistory()
term.clear()
term.setCursorPos(1,1)
term.setTextColor(colors.blue)
print("=== Calculation History ===")
term.setTextColor(colors.white)
if #history == 0 then
print("No calculations yet.")
else
for i, entry in ipairs(history) do
term.setTextColor(colors.green)
print(i .. ". " .. entry)
end
end
term.setTextColor(colors.white)
print("\nPress any key to return...")
os.pullEvent("key")
end
local function mathOperations()
local selected = 1
drawMenu("Math Operations", mathMenu, selected)
while true do
local event, key = os.pullEvent("key")
if key == keys.up then
selected = (selected - 2) % #mathMenu + 1
elseif key == keys.down then
selected = (selected % #mathMenu) + 1
elseif key == keys.enter then
local op = mathMenu[selected]
if op == "Back" then
return
elseif op == "Square Root" then
local num = readNumber("Enter number: ")
if num < 0 then
term.setTextColor(colors.red)
print("Error: Cannot take square root of a negative number.")
else
local result = math.sqrt(num)
local output = string.format("√%.2f = %.4f", num, result)
term.setTextColor(colors.green)
print("Result: " .. output)
table.insert(history, output)
end
else
local a = readNumber("Enter first number: ")
local b = readNumber("Enter second number: ")
local result, output
if op == "Addition" then
result = a + b
output = string.format("%.2f + %.2f = %.2f", a, b, result)
elseif op == "Subtraction" then
result = a - b
output = string.format("%.2f - %.2f = %.2f", a, b, result)
elseif op == "Multiplication" then
result = a * b
output = string.format("%.2f * %.2f = %.2f", a, b, result)
elseif op == "Division" then
if b == 0 then
term.setTextColor(colors.red)
print("Error: Division by zero.")
else
result = a / b
output = string.format("%.2f / %.2f = %.2f", a, b, result)
end
elseif op == "Power" then
result = a ^ b
output = string.format("%.2f ^ %.2f = %.2f", a, b, result)
end
if output then
term.setTextColor(colors.green)
print("Result: " .. output)
table.insert(history, output)
end
end
term.setTextColor(colors.white)
print("\nPress any key to return...")
os.pullEvent("key")
drawMenu("Math Operations", mathMenu, selected)
end
drawMenu("Math Operations", mathMenu, selected)
end
end
local function main()
local selected = 1
drawMenu("Calculator", mainMenu, selected)
while true do
local event, key = os.pullEvent("key")
if key == keys.up then
selected = (selected - 2) % #mainMenu + 1
elseif key == keys.down then
selected = (selected % #mainMenu) + 1
elseif key == keys.enter then
local choice = mainMenu[selected]
if choice == "Calculations" then
mathOperations()
elseif choice == "View History" then
showHistory()
elseif choice == "Shutdown" then
term.setTextColor(colors.red)
print("\nNeobox OS Alpha shutting down. Goodbye!")
sleep(1.5)
os.shutdown()
end
drawMenu("Calculator", mainMenu, selected)
end
drawMenu("Calculator", mainMenu, selected)
end
end
main()

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