Who is credited with inventing the first mechanical calculator?*Alan TuringAda LovelaceCharles BabbageBlaise Pascal

The invention of the first mechanical calculator is credited to Blaise Pascal. In 1642, Pascal developed the Pascaline, which was capable of performing basic arithmetic operations such as addition and subtraction. This early mechanical device used gears and could handle numbers up to eight digits, marking a significant milestone in the history of computing.

The other figures mentioned, such as Charles Babbage, are notable for their contributions to computing as well, particularly Babbage's work on the Analytical Engine, which is considered a precursor to modern computers. However, the distinction of creating the first mechanical calculator specifically belongs to Pascal.

In summary, Blaise Pascal is the correct answer.