给你看看《微软计算机辞典》的释义:
code
n.
1.Program instructions. Source code consists of human-readable statements written by a programmer in a programming language. Machine code consists of numerical instructions that the computer can recognize and execute and that were converted from source code. See also data, program.
2. A system of symbols used to convert information from one form to another. A code for converting information in order to conceal it is often called a cipher.
3. One of a set of symbols used to represent information.