Technical Interview Questions and Answers :: TCS

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a failure in a program to release discarded memory, causing impaired performance or failure.

Declaring a variable is initializing a variable where as defining a variable is defining what variables you are initialized.

By default the value unchanged means we can give as static.
Variable which is declared as static and no further initialisation then static variable takes value from zero.

Register variables are a special case of automatic variables. Automatic variables are allocated storage in the memory of the computer; however, for most computers, accessing data in memory is considerably slower than processing in the CPU. These computers often have small amounts of storage within the CPU itself where data can be stored and accessed quickly. These storage cells are called registers.

Each program is allocated two types of storage stack and heap .Auto variables are also known as local variable
and  are stored in stack.

Scope: it defines the life time of a variable depends on declaration of a variable.If it is declared inside the variable it is local variable,If it is outside it is global variable.
Extern variables: belong to the External storage class and are stored in the main memory

Register variables: is the register storage class and are stored in the CPU registers.
The scope of the register variables is local to the block in which the
variables are defined. The variables which are used for more number of
times in a program are declared as register variables for faster access.