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## Compiling a Simple Program

- `#include<iostream>` - read the file `iostream` that contains the definition for the stream input/output package.
- `using namespace std;` - all names in the program belong to the "standard namespace"
- `int main () { ... }` defines a function called `main`. A function is a collection of instructions that carry out a particular task.
- The statements (instructions) inside the body (inside the curly braces `{ ... }`) of the main function are executed one by one.
- Each statement ends with a semicolon ;
- The sequence of characters enclosed in quotations marks (`"Hello, World\n"`) is called a string.
  - Escape sequence`\n` indicates a newline.
  - Use `\"` to display quotes.
- `return` denotes the end of the main function. The zero value is a signal that the program ran successfully.

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