Const and # difine

Source: Internet
Author: User

Compared with # difine, const

A: The C ++ language can use const to define constants or # define to define constants. However, the former has more advantages than the latter:

  • Const constants have data types, while macro constants do not. The compiler can perform type security checks on the former, while only character replacement on the latter, without type security checks, and unexpected errors (marginal effect) may occur during character replacement ).
  • Some integrated debugging tools can debug const constants, but cannot debug macro constants. In the C ++ program, only the const constant is used instead of the macro constant, that is, the const constant completely replaces the macro constant.

[From the programmer interview book]

Const and # difine

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