A high level programming language facilitates human interaction with the target machine. Most of the popular high level languages today have certain basic elements such as variables, loops, if-else decision making statements, blocks, functions, and so on. A variable holds value of data types; a basic block gives an idea of the scope of the variable. An if-else decision statement helps in selection of a path of code. A function makes a block of code reusable. High level languages may vary in type checking, type casting, variable declarations, complex data types, and so on. However, almost every other language has the basic building blocks listed earlier in this section.
A language may have its own parser which tokenizes the statement and extracts meaningful information such as identifier, its data type; a function name, its declaration, definition and calls; a loop condition, and so on. This meaningful information may be stored in a data structure where the flow...