The necessary/motive of compiler : A compiler is a program that reads a program written in one language - the source language & translates it into an equivalent program in another language - the target language.
So, the main motive of compiler that if reports to its user the presence of errors in the source program.
A compiler can also assist in producing reliable program. For Example, a compiler could check that the types of operands are compatible.
Compiler can also acts as index by using symbol table.
Some compiler makes the use of an assembler as an appendage.
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