Answer Posted / sanjay

A compiler compiles the source code in a form that can be
used directly by the computer. At run time the code is to
run the programme is already there.

An interpreter reads each line of the source code and
converts it to machine code on the fly. This happens every
time the programme is run. Consequently it is very slow as
it is converting source code to machine code while the
programme is running.

A compiler does it once and thats it.

So the trade off is speed.

DOS BASIC was interpreted. QBASIC could be either. VB, C++
and all modern high level languages are compliled. Nobody
uses an interpreter for anything serious although an
interpreted programme can be a good teaching aid

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