There is a slogan among computer operators: GIGO (garbage in, garbage out). This phrase reflects the fact that a computer will do exactly what it is told to do. Consider the following humorous story.

A very large computer system has been created for the military. It was built and staffed by the best computer people in the country. “The system is now ready to answer questions,” said the spokesperson for the project. A four-star general bit off the end of a cigar, looked whimsically at his comrades, and said, “Ask the machine if there will be war or peace.” The machine replied: YES. “Yes what?” bellowed the general. The operator typed in this question, and the machine answered: YES, SIR!

In terms of what you know about logic, why did the computer correctly answer the first question YES?