This document summarizes different data types including numeric, enumeration, Boolean, character, character strings, pointers, files, and input-output. It provides details on integer, floating-point real numbers, fixed-point real numbers, character strings, and pointers and programmer-constructed data objects. Integer data types can represent a finite set of mathematical integers and have different sizes and may or may not contain negative values. Floating-point numbers use a mantissa-exponent representation similar to scientific notation. Fixed-point numbers have a predefined number of decimal places. Character strings can have fixed or variable lengths and support operations like concatenation and substring selection. Pointers reference data in memory and programmer-constructed objects can be complex data