Why C plus plus is a high and low level language?

Answer 1

It is high-level because it uses abstraction. That is, a single C++ instruction can easily create several dozen assembler instructions. Assembler is low level because every symbolic instruction translates directly into machine code -- there is very little in the way of abstraction. Thus the coder is almost entirely responsible for the integrity of their code, down to the minutae, and errors can be difficult to spot due to the lack of the safeguards that C++ automatically provides.

C++ is not a low-level language per se, but it does include low level features, such as direct manipulation of memory contents via pointer variables, including pointers to functions. Also, by examining the resulting assembler instructions, code can be optimised to a much higher degree than is possible with more abstract languages, such as Java. Thus highly efficient code comparable to that of assembler can be produced.