Enter a decimal (real) number into the field labeled "Decimal" and press "toDouble" to convert it into the "IEEE 754 floating point double-precision" bit layout.
Enter "NaN" into the field labeled "Decimal" and press "toDouble" to see how Not-a-Number values are represented in IEEE 754.
Enter "Infinity" or "-Infinity" into the field labeled "Decimal" and press "toDouble" to see how the bits for infinite values are represented in IEEE 754.