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The first mechanical calculating machine, a precursor of the digital computer was invented in 1642 by French mathematician Blaise Pascal. One device used a series of wheels on which ten teeth each tooth representing a digit from 0 to 9.
Also in the nineteenth century British mathematician and inventor Charles Babbage worked out the principles of modern digital computer. He invented a series of machines, as the Difference Engine, designed to solve complex mathematical problems.
Analog computers began to be built in the early twentieth century. The first model calculations performed by rotating shafts and gears. With these machines evaluated the numerical approximations of equations too difficult to be able to be resolved by other methods.
During World War II (1939-1945), a team of scientists and mathematicians working in Bletchley Park, north London, created what was considered the first fully electronic digital computer, the Colossus. By December 1943, Colossus, 1500 incorporating valves or vacuum tubes, was already operational. It was used by the team led by Alan Turing to decode encrypted radio messages from the Germans.