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--> why computers not used high level language as a first Language what are the main reasons?

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In (very) short : Because basically a computer is composed of multiple electronic devices that consistently switch between two states (see transistors). For a human, this can be idealized by a state 0 or a state 1 from which the binary is derived. This is the core language, close to processor instructions, only then appears low-level languages and high level languages that provide more abstraction level.

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