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| | programming language. The Columbia Encyclopedia, Sixth Edition. 2001-05 |
 | | All computers operate by following machine language programs, a long sequence of instructions called machine code that is addressed to the hardware of the computer and is written in binary notation (see numeration), which uses only the digits 1 and 0. |
 | | PL/1 [Programming Language 1], developed in the late 1960s by the IBM Corp., and ADA [for Ada Augusta, countess of Lovelace, biographer of Charles Babbage], developed in 1981 by the U.S. Dept. of Defense, are designed for both business and scientific use. |
 | | With some languages, such as C or Pascal, the program is turned into a separate machine language program by a compiler, which functions much as an assembler does. |
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