In analog computer Input is never converted to digital form.
A device that processes infinitely varying signals, such as voltage or frequencies. A thermometer is a simple analog computer. ... Although special-purpose, complex analog computers are built, almost all computers are digital. Digital methods provide programming flexibility.
An analog computer is a computer which is used to process analog data. Analog computers store data in a continuous form of physical quantities and perform calculations with the help of measures. It is quite different from the digital computer, which makes use of symbolic numbers to represent results.