Integer

Integer

In computer science, an integer is a datum of integral data type, a data type which represents some finite subset of the mathematical integers. Integral data types may be of different sizes and may or may not be allowed to contain negative values. Integers are commonly represented in a computer as a group of binary digits. The size of the grouping varies so the set of integer sizes available varies between different types of computers. Computer hardware nearly always provides a way to represent a processor register or memory address as an integer.  

Real

  Constants in C are fixed value that does not change during the execution of a program. A real constant is combination of a whole number followed by a decimal point and the fractional part. Example: 0.0083   -0.75   .95   215.       

Character;

·  It is a single alphabet or a digit or a special symbol enclosed in a single quote.

·  Maximum length of a character constant is 1.

·  Example:
'T', '9', '$'