# NCERT Computer: Chapter 7 – Introduction to C + + Part 2

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## 3 C++ Character Set

Character set is a set of valid characters that a language can recognised. A character represents any letter, digit or any other special character.

The C++ has the following character set.

## 4 Basic Data Types

Every program specifies a set of operations to be done on some data in a particular sequence.

However, the data can be of many types such as a number, a character, boolean value etc. C++ supports a large number of data types.

### 1 Integer type (int)

An integer is an integral whole number without a decimal point.

These numbers are used for counting. These numbers are used for counting.

Normally an integer can hold numbers from **-32768 to 32767**.

However, if the need be, a long integer (long int) can also be used to hold integers from -2, 147, 483, 648 to 2, 147, 483, 648.

### 2 Floating point type (float)

A floating point number has a decimal point.

Even if it has an integral value, it must include a decimal point at the end. These numbers are used for measuring quantities.

Examples of valid floating point numbers are:

A float type data can be used to hold numbers from with six or seven digits of precision

However, for more precision a double precision type (double) can be used to hold numbers from with about 15 digits of precision.

### 3 Character Type ((Char)

It is a non-numeric data type consisting of single alphanumeric character. Examples of valid character types are : ‘A’, ‘9’, ‘P’, ‘8’, ‘&’.

It may be noted here that 9 and ‘9’ are of different data types.

The former is of type int and later of type char.