Final answer:
During the compilation phase, the source code is converted into machine code. Automatic variables created are local variables within a function.
Step-by-step explanation:
During the compilation phase, the source code is converted into machine code that can be executed by the computer. It involves several steps such as lexical analysis, syntax analysis, semantic analysis, code generation, and optimization. The automatic variables created during compilation are local variables defined within a function.
They are automatically created and destroyed when the function is called and returns, respectively. These variables are used to store temporary data and serve the purpose of holding values within the scope of the function being executed.