What language is used to build low level languages like c++ and java?
How could you build the first language with no language?
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What language is used to build low level languages like c++ and java?
How could you build the first language with no language?
In the context of compilers, this operation is often called bootstrapping. In particular, see the “Chicken and egg problem” section for a direct answer to your question.
The very first compiler would have been hand-written in assembly language. If your next question is “how was the first assembler written?” then the answer would be that the first assembler was hand-written in binary machine code, possibly with front panel toggle switches. This is undoubtedly a simplification of what really happened, but the concept is the same.
There is also an excellent article titled Reflections on Trusting Trust by Ken Thompson about the risks of using a compiler for a language to build the compiler for that language.