Enumeration,also known as enum in c, is a user defined data type.it consists of constant integrals or integers that have names assigned to them by the user. Because the integer values are named with enum in c,the whole program Is simple to learn , understand,and maintain by the same or even different programmer
The register storage class specifier instructs the compiler to store the object in a machine register.
The register storage class specifier is often used for frequently used variables, such as a loop control variable, to improve efficiency by reducing the access time.
The register storage class is used to specify which local variables should be saved in a register rather than RAM.
This signifies that the variable has a maximum size equal to the register size (typically one word) and cannot be used with the unary ‘&’ operator (since it lacks a memory address).