ENIAC (Electronic Numerical Integrator And Computer) was the first electronic general-purpose computer. It was Turing-complete, digital, and capable of being reprogrammed to solve a full range of computing problems
in full Electronic Numerical Integrator and Computer. Early electronic digital computer built in the U.S. in 1945 by J. Presper Eckert and John W. Mauchly. The massive ENIAC, which weighed 30 tons and filled an entire room, used some 18,000 vacuum tubes, 70,000 resistors, and 10,000 capacitors. In December 1945 it solved its first problem, calculations for the hydrogen bomb. After its official unveiling in 1946, it was used to prepare artillery-shell trajectory tables and perform other military and scientific calculations