Read across software

This article needs additional citations for verification. A software bug is an error, flaw, failure or fault in a computer program or system that read across software it to produce an incorrect or unexpected result, or to behave in unintended ways. Most bugs arise from mistakes and errors made in either a program’s source code or its design, or in components and operating systems used by such programs.

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A few are caused by compilers producing incorrect code. Some software bugs have been linked to disasters. Bugs in code that controls the Therac-25 radiation therapy machine were directly responsible for patient deaths in the 1980s. It has been just so in all of my inventions. The first step is an intuition, and comes with a burst, then difficulties arise—this thing gives out and then that “Bugs”—as such little faults and difficulties are called—show themselves and months of intense watching, study and labor are requisite before commercial success or failure is certainly reached. The Middle English word bugge is the basis for the terms “bugbear” and “bugaboo” as terms used for a monster. Isaac Asimov used the term “bug” to relate to issues with a robot in his short story “Catch That Rabbit”, published in 1944.

A page from the Harvard Mark II electromechanical computer’s log, featuring a dead moth that was removed from the device. The term “bug” was used in an account by computer pioneer Grace Hopper, who publicized the cause of a malfunction in an early electromechanical computer. In 1946, when Hopper was released from active duty, she joined the Harvard Faculty at the Computation Laboratory where she continued her work on the Mark II and Mark III. Hopper did not find the bug, as she readily acknowledged.

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