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Fundamentals of Computer Programming

C++ has several fundamental data types including int, float, double, char, wchar_t, bool, and void. The document describes the size and usage of each data type. Integers are usually 4 bytes and store whole numbers. Float and double store decimals and exponentials at 4 and 8 bytes respectively. Char stores single characters at 1 byte while wchar_t stores wider characters at 2 bytes. Bool stores true or false values. Void indicates no data type.

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42 views9 pages

Fundamentals of Computer Programming

C++ has several fundamental data types including int, float, double, char, wchar_t, bool, and void. The document describes the size and usage of each data type. Integers are usually 4 bytes and store whole numbers. Float and double store decimals and exponentials at 4 and 8 bytes respectively. Char stores single characters at 1 byte while wchar_t stores wider characters at 2 bytes. Bool stores true or false values. Void indicates no data type.

Uploaded by

Isuru Madushan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Fundamentals

of Computer Programming
By: Deshan Bulathsinghala (BSc In MIS UCD-Ireland, MSc in IT (Rdg –
UCSC)
Lecturer – Faculty of Information Technology and Sciences
International College of Business and Technology
C++ Data Types

• Data types are very useful in declaring variables in programming.


C++ Fundamental Data Types
Data Type Meaning Size (in Bytes)

int Integer 2 or 4

float Floating-point 4

double Double Floating-point 8

char Character 1

wchar_t Wide Character 2

bool Boolean 1

void Empty 0
1. C++ int
• The int keyword is used to indicate integers.
• Its size is usually 4 bytes. Meaning, it can store values from -
2147483648 to 214748647.
For example,
• int salary = 85000;
2. C++ float and double
• float and double are used to store floating-point numbers
(decimals and exponentials).
• The size of float is 4 bytes and the size of double is 8 bytes.
Hence, double has two times the precision of float. To learn more,
visit C++ float and double.
For example,
• float area = 64.74;
• double volume = 134.64534;
• As mentioned above, these two data types are also used for
exponentials. For example,
• double distance = 45E12 // 45E12 is equal to
45*10^12
3. C++ char
• Keyword char is used for characters.
• Its size is 1 byte.
• Characters in C++ are enclosed inside single quotes ' '.
For example,
• char test = 'd';

• Strings : Bunch of characters

String sName = "Amal";


4. C++ wchar_t
• Wide character wchar_t is similar to the char data type, except its
size is 2 bytes instead of 1.
• It is used to represent characters that require more memory to
represent them than a single char.
For example,
• wchar_t test = L'‫ 'ם‬// storing Hebrew character;
•
5. C++ bool
• The bool data type has one of two possible values: true or false.
• Booleans are used in conditional statements and loops (which we will
learn in later chapters).
For example,
• bool cond = false;
6. C++ void
• The void keyword indicates an absence of data. It means "nothing"
or "no value".
• We will use void when we learn about functions and pointers.
• Note: We cannot declare variables of the void type.

• Void marks = 75; wrong

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