Parts of the Program
This program consists of a single function called main. This function, which appears on line 1, has two parameters (inside the parentheses) and returns a number value (the starting int).
A function is a single group of code lines that perform a particular task. It has a heading at the top, with the function name as the second word and a body that starts with an opening brace ({) and ends with a closing brace (}). The closing brace optionally ends with a semicolon. More details about functions will be discussed in Lesson 7, “Functions.”
main is a function that is required in all C++ programs. Your system provides the parameters it receives (called arguments for reasons beyond our interest in this lesson). These are
int argc ...
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