What is disadvantage oe high level language?

Answer 1

In low level langauges like Assembly, you are working with the lowest possible chunks of code you can, machine code. The higher the level of a language, the more abstractions you use to organize ideas, and therefore, the less efficient it can become. For example, a regular integer in C or C++ on a 32bit system is simply 4 bytes. It can only represent a certain range of numbers, however. In the even higher level language of python, a number is an arbitrary number of bytes and can be as big as it needs to be, but a number in python is slightly bigger than the same number in C or C++ because it's structured differently.