1. Introduction
  2. Variable Data-Type and Operator
    1. Variable
    2. Data Type
    3. Identifier name
    4. Variable Definition in C++
    5. Variable Declaration in C++
    6. Defining Constants
    7. Operator
      1. Arithmetic Operators
      2. Relational Operators
      3. Logical Operators
  3. Control Statement
    1. The if Statement
    2. The if – else statement
    3. The else if statement
    4. Nested if-else
    5. The switch statement
  4. Loop
    1. While loop
    2. Do while loop
    3. For loop
    4. Nested Loop
    5. Break, Continue And Go to label
  5. Function
    1. Declaration function
    2. Non Return Function
    3. Return Function
    4. Function Definition
  6. Array
    1. Declaration Array
      1. One Dimensional Array
      2. Two Dimensional Array
  7. Class and Object

2.2.Data Type #

Primitive Built-in Types

C++ offers the programmer a rich assortment of built-in as well as user defined data types. Following table lists down seven basic C++ data types –

Bool Char Int Float Double Void Wchar_t

The table below shows you how much of memory and how long of digit that can be stored on data type choosing.

Type Typical Bit Width Ranges Type & Description
Bool 1byte True/false Stores either value true or false.
unsigned char 1byte 0 to 255 Typically a single octet (one byte). This is an integer type.
signed char 1byte -127 to 127
Int 4bytes -2147483648 to 2147483647 The most natural size of integer for the machine.
unsigned int 4bytes 0 to 4294967295
signed int 4bytes -2147483648 to 2147483647
short int 2bytes -32768 to 32767
unsigned short int Range 0 to 65,535
signed short int Range -32768 to 32767
long int 4bytes -2,147,483,648 to 2,147,483,647
signed long int 4bytes same as long int
unsigned long int 4bytes 0 to 4,294,967,295
Float 4bytes +/- 3.4e +/- 38 (~7 digits) A double-precision floating point value.
Double 8bytes +/- 1.7e +/- 308 (~15 digits)
long double 8bytes +/- 1.7e +/- 308 (~15 digits)
wchar_t 2 or 4 bytes 1 wide character A wide character type.
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