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= parseFloat(previous); const b = parseFloat(current); switch(operator) { case '+': current = (a + b).toString(); break; case '-': current = (a - b).toString(); break; case '*': current = (a * b).toString(); break; case '/': current = b !== 0 ? (a / b).toString() : 'Error'; break; } operator = null; previous = null; } } else { if (operator && previous !== null) { const a