C++ Data Types

The following is a tutorials in data types of c++...i hope this helps in some way...

When dealing with storage and interpretation of numbers in C++, we have several different data types to represent them with. The type and size of a number that we can represent depends on the variable type that we choose for it. There are two basic categories that non-rational (not in fractional form) numbers fall into mathematically: integers and real numbers (without taking into account complex numbers).

Integers - are whole numbers, positive and negative. All integers are also real numbers.

Integers = {0,1,2,3,-2,-1, ...}

Real Numbers - include all positive and negative numbers with fractional parts written past the decimal (or radix) point .

Real Numbers = {0,1,1.3,-2.65,1.00025, ...}

In the world of computer science, real numbers are represented with a floating-point type.



Here is a chart of primitive variable types used to represent numbers in C++:

Variable Type Represents

char -- Small Integer (one byte)

unsigned char-- Small Positive Integer (one byte)
short -- Integer
unsigned short -- Positive Integer
int -- Larger Integer
unsigned int -- Larger Positive Integer
long -- Even Larger Integer
unsigned long -- Even Larger Positive Integer
float -- Floating-point
double -- Floating-point with more accuracy
long double -- Floating-point with even more accuracy

NOTE: The range of numbers a data type can store depends on the system platform you are using. If you are using a 32-bit system such as Windows 95 and up an int will 32 bits (4 bytes). If you are using DOS an int will be 16-bits (2 bytes). You should refer to the specific documentation for your system to determine these values.


However, there are a couple of non-numerical* values that we would like to represent in C++.

Boolean - a logical value of true or false.

Character - printable characters and special characters.



Here is how these are represented in C++.

Variable Type Represents Range

bool -- Boolean (Logical true or false) true or false
char -- System Character System Dependent
unsigned char -- System Character System Dependent

NOTE: Notice that character data types can also store a numerical value that corresponds to a specific character. For example, the ASCII value for 'A' is 65.

If the format of typing is in anyway unclear just let me know...

-kolij-