Constants in C refer to fixed values that do not change during the executing of a program. C Support several types of constants are listed below.
Single Character Constants
An integers constant refers to a sequence of digits. There are three types of integers namely decimal, integers, octal integer and hexadecimal integer.
Examples : 125 -562 0 9635 +776
Embedded space, commas, and non-digit characters are not permitted between digits. Below examples are illegal numbers.
Examples : 15 750 20,000 $6325