Before smartphones and instant unlocking apps, we had the . It was the hacker’s Swiss Army Knife of the early 2000s.

if (operator.equals("+")) res = n1 + n2; else if (operator.equals("-")) res = n1 - n2; else if (operator.equals("*")) res = n1 * n2; else if (operator.equals("/")) if (n2 != 0) res = n1 / n2; else siResult.setText("Result: Error"); return;

No jailbreaks, no cables—just pure math and risk (get it wrong 5 times and the phone was hard-locked!). Who else remembers the #pw+ command? ⌨️📲

Command cmdAdd = new Command("Add", Command.OK, 1); Command cmdSub = new Command("Subtract", Command.OK, 2); Command cmdMul = new Command("Multiply", Command.OK, 3); Command cmdDiv = new Command("Divide", Command.OK, 4); Command cmdEq = new Command("Equals", Command.OK, 5); Command cmdExit = new Command("Exit", Command.EXIT, 1);

: Some tools are older 32-bit applications that may require specific system files (like mscomctl.ocx ) to run on modern Windows 10 or 11 environments. Popular Calculator Variants Known Features Crux Calc