Step 3: Coding Block:
A coding block in C++ starts and ends with a pair of curly
braces. All statements must end with semicolon (;). The
function "int" defines that this expects an integer to be returned,
and "return 0" at the end of the blocks, means that program
C++ Main Function: C++ codes must contain "main" function as an
entry point. Here # is a preprocessor directive, that will browse a
library (file) for input and out put operations.