Inventors J. Presper Eckert and J.W. Mauchly work on the ENIAC. In 1943 the U.S. Army contracted the University of Pennsylvania's Moore School of Electrical Engineering to develop a calculator to compute artillery firing tables. Early in 1946, the Computer Age began when Penn engineers J. Presper Eckert and J.W. Mauchly unveiled the Electronic Numerical Integrator and Computer (ENIAC), the world's first general-purpose electronic computer. 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. ENIAC's design and construction was financed by the United States Army during World War II. The construction contract was signed in 1943, and work on the computer began in secret under the code name "Project PX" and was completed in 1946. It cost $400,000, used 18,000 radio tubes, and was housed in a 30-foot-by-50-foot room.