C++ Data Types

In C++ language four types of data types:

• Primary data types - int, char, float, double, etc
• User-defined data types - structure
• Derived data types - array, pointer, etc
• Enumeration Data Type - enum

1. Primary Data Types:

There are four fundamental data types. They are an integer (int), character (char), floating point (float), double floating point (double).

Integer:

It is used to represent integers in C++. Int data type range should be include -32767 to 32767.

int variable_name;

Character:

It represents an individual character value i.e. a letter, a digit, or a specific symbol. Each type char value is enclosed in single quotes.

char variable_name;

Floating Point:

In this numbers are stored in 32 bits, with 6 digits of precision.

float variable_name;

Double Floating Point:

This type of data type is used to represent real numbers. It uses 64 bits with 14 digits precision.

double variable_name;

2. User-defined data types:

It enables a program to invent his own data types. User-defined data types can help a programmer to reduce programming errors.

3. Derived data type:

It is created from the basic integers, characters, and floating data types. Ex: Arrays, Pointers, etc..

4. Enumerated Data Types

Enumerated Data Types must use the keyword of "enum".

 enum enum-name { list of names } var-list;

Example:

#include <iostream>
using namespace std;
                    
int main() 
{ 
	cout << "Storage size for character: "<< sizeof(char) << endl;
	cout << "Storage size for int : "<< sizeof(int) << endl;
	cout << "Storage size for float : " << sizeof(float) << endl;
	cout << "Storage size for double : "<< sizeof(double) << endl;
	cout << "Storage size for long : "<< sizeof(long int) << endl;
	return 0;
}