Data Type: Anything that is processed by a computer is called data. There are different types of data that can be given to the computer for processing. Types:- Int ->2 bytes in Float -> floating point numbers, up to 4 bytes in Double -> floating point number with double precision. These are organized in 8 bytes (64 bits) Char -> character type size of 1 byte (8 bits). It is used to form the strings(sequence of characters). Array: – an array is collection of data having same data type. For example: – int a . Here “a” is an array of five-integer value. A number called index indexes all numbers. By default index is zero.