# 4.4.1: Literals and Constants - Integers

## Integer Literals

These are used to represent and store the integer values. Integer literals are expressed in two types i.e.,

1. Prefixes: The Prefix of the integer literal indicates the base in which it is to be read.
For example:
0x10 = 16

Because 0x prefix represents a HexaDecimal base.
So 10 in HexaDecimal is 16 in Decimal.
Hence the value 16.


There are basically represent in four types.

1. Decimal-literal(base 10): A non-zero decimal digit followed by zero or more decimal digits(0, 1, 2, 3, 4, 5, 6, 7, 8, 9).

For example:

56, 78

2. Octal-literal(base 8): a 0 followed by zero or more octal digits(0, 1, 2, 3, 4, 5, 6, 7).

For example:

045, 076, 06210

3. Hex-literal(base 16): 0x or 0X followed by one or more hexadecimal digits(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, A, b, B, c, C, d, D, e, E, f, F).

For example:

0x23A, 0Xb4C, 0xFEA

4. Binary-literal(base 2): 0b or 0B followed by one or more binary digits(0, 1).

For example:

0b101, 0B111

2. Suffixes: The Prefix of the integer literal indicates the type in which it is to be read.

For example:

12345678901234LL
indicates a long long integer value 12345678901234
because of the suffix LL


These are represented in many ways according to their data types.

1. int: No suffix is required because integer constant is by default assigned as an int data type.
2. unsigned int: character u or U at the end of an integer constant.
3. long int: character l or L at the end of an integer constant.
4. unsigned long int: character ul or UL at the end of an integer constant.
5. long long int: character ll or LL at the end of an integer constant.
6. unsigned long long int: character ull or ULL at the end of integer constant.

Example:

#include <iostream>
using namespace std;

int main()
{   // constant integer literal

const int intVal = 10;

cout << "Integer Literal: " << intVal << "\n";
return 0;
}

Integer Literal: 10