Storage Classes in C
Storage Classes are used to describe the features of a variable/function. These features basically include the scope, visibility and life-time which help us to trace the existence of a particular variable during the runtime of a program.
A- Storage classes in C
B- Automatic variables
C- External variables or Global variable
D- Static variables
E- Register variables
Problem when extern is not used
Example Using extern in same file
C Programming Language is the most popular computer language and most used programming language till now. It is very simple and elegant language. This lecture series will give you basic concepts of structured programming language with C.
Automatic Variables
extern variables
static variables
register variables
Examples of above listed variables.
Summary of storage place, Initial value, scope and life of variables.
C Programming Language is the most popular computer language and most used programming language till now. It is very simple and elegant language. This lecture series will give you basic concepts of structured programming language with C.
A- Storage classes in C
B- Automatic variables
C- External variables or Global variable
D- Static variables
E- Register variables
Problem when extern is not used
Example Using extern in same file
C Programming Language is the most popular computer language and most used programming language till now. It is very simple and elegant language. This lecture series will give you basic concepts of structured programming language with C.
Automatic Variables
extern variables
static variables
register variables
Examples of above listed variables.
Summary of storage place, Initial value, scope and life of variables.
C Programming Language is the most popular computer language and most used programming language till now. It is very simple and elegant language. This lecture series will give you basic concepts of structured programming language with C.
C Programming Language is the most popular computer language and most used programming language till now. It is very simple and elegant language. This lecture series will give you basic concepts of structured programming language with C.
A storage class defines the scope (visibility) and life time of variables and/or functions within a C++ Program. There are following storage classes which can be used in a C++ Program
auto
register
static
extern
this slide is for to understand the conditions which are applied in C++ programming language. I hope u would understand better by viewing this presentation.
This page contains examples and source code on decision making in C programming (to choose a particular statement among many statements) and loops ( to perform repeated task ). To understand all the examples on this page, you should have knowledge of following topics:
if...else Statement
for Loop
while Loop
break and Continue Statement
switch...case
what are loop in general
what is loop in c language
uses of loop in c language
types of loop in c language
program of loop in c language
syantax of loop in c language
C Programming Language is the most popular computer language and most used programming language till now. It is very simple and elegant language. This lecture series will give you basic concepts of structured programming language with C.
A storage class defines the scope (visibility) and life time of variables and/or functions within a C++ Program. There are following storage classes which can be used in a C++ Program
auto
register
static
extern
this slide is for to understand the conditions which are applied in C++ programming language. I hope u would understand better by viewing this presentation.
This page contains examples and source code on decision making in C programming (to choose a particular statement among many statements) and loops ( to perform repeated task ). To understand all the examples on this page, you should have knowledge of following topics:
if...else Statement
for Loop
while Loop
break and Continue Statement
switch...case
what are loop in general
what is loop in c language
uses of loop in c language
types of loop in c language
program of loop in c language
syantax of loop in c language
Latest C Interview Questions and AnswersDaisyWatson5
3. What is a register variable?
Register variables are stored in the CPU registers. Its default value is a garbage value. Scope of a register variable is local to the block in which it is defined. Lifetime is till control remains within the block in which the register variable is defined. Variable stored in a CPU register can always be accessed faster than the one that is stored in memory. Therefore, if a variable is used at many places in a program, it is better to declare its storage class as register
Example: register int x=5;
Variables for loop counters can be declared as register. Note that register keyword may be ignored by some compilers.
4. Where is an auto variables stored?
Main memory and CPU registers are the two memory locations where auto variables are stored. Auto variables are defined under automatic storage class. They are stored in main memory. Memory is allocated to an automatic variable when the block which contains it is called and it is de-allocated at the completion of its block
execution.
Auto variables:
Storage
:
main memory.
Default value
:
garbage value.
Scope
:
local to the block in which the variable is defined.
Lifetime
:
till the control remains within the block in which the variable is defined.
5. What is scope & storage allocation of extern and global variables?
Extern variables: belong to the External storage class and are stored in the main memory. extern is used when we have to refer a function or variable that is implemented in another file in the same project. The scope of the extern variables is Global.
C Preprocessor directives:
i\ Before a C program is compiled in a compiler, source code is processed by a program called preprocessor. This process is called preprocessing.
Commands used in preprocessor are called preprocessor directives and they begin with “#” symbol.
Pointers in C language is a variable that stores/points the address of another variable. A Pointer in C is used to allocate memory dynamically i.e. at run time.
C for Loop
Loops are used in programming to execute a block of code repeatedly until a specified condition is met. In this tutorial, you will learn to create for loop in C programming.
C programming has three types of loops:
for loop
while loop
do...while loop
Generations of Computer
Introduction:
A computer is an electronic device that manipulates information or data. It has the ability to store, retrieve, and process data.
Nowadays, a computer can be used to type documents, send email, play games, and browse the Web. It can also be used to edit or create spreadsheets, presentations, and even videos. But the evolution of this complex system started around 1946 with the first Generation of Computer and evolving ever since.
There are five generations of computers.
C - Unions
A union is a special data type available in C that allows to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purpose.
Structures in C
What is a structure?
A structure is a user defined data type in C/C++. A structure creates a data type that can be used to group items of possibly different types into a single type.
The symbols which are used to perform logical and mathematical operations in a C program are called C operators. These C operators join individual constants and variables to form expressions. Operators, functions, constants and variables are combined together to form expressions. Consider the expression A + B * 5.
Functions - C Programming
What is a Function? A function is combined of a block of code that can be called or used anywhere in the program by calling the name. ...
Function arguments. Functions are able to accept input parameters in the form of variables. ...
Function return values
Dynamic memory allocation in c languageTanmay Modi
C dynamic memory allocation refers to performing manual memory management for dynamic memory allocation in the C programming language via a group of functions in the C standard library, namely malloc, realloc, calloc and free. ... Their performance varies in both execution time and required memory.
Decision making in C. Decision making is about deciding the order of execution of statements based on certain conditions or repeat a group of statements until certain specified conditions are met. C language handles decision-making by supporting the following statements, if statement.
Array in C Language
Featured snippet from the web
C - Arrays
An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type. ... A specific element in an array is accessed by an index. All arrays consist of contiguous memory locations.
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2. Introduction
Variables declared in C programs are
different than other programming
languages.
Can use the same variable names in the
C program in separate blocks.
When we declare a variable,it is
available only to a specific part or block
of the program.
Remaining block or other functions
cannot access the variable.
Variables declared within functions are
called local variables and those declared
outside are called external or global
variables.
3. Definition
Scope of variables:
The area or scope of the C program from
where the variable can be accessed.
The area or scope of the variable
depends on its storage class i.e. Where
and how it is declared.
The storage class of a variable tells the
compiler:
i)the storage area of the variable
ii)the initial value of the variable.
Iii)the scope of the variable.
Iv) the life of the variable i.e. How long the
variable would be active in the program.
4. Variables declared in C can have any
one of the four storage classes:
Automatic
External
Static
Register
5. Lifetime of a Variable
Every variable has a lifetime i.e. Its time
duration during which its status is active
in the program.
The time gap between its declaration
and ckeanup.
The lifetime depends upon the storage
class.
For eg,auto variable gets destroyed
immediately when the function execution
is over,whereas static variable remains in
the memory.
6. Visibility of a Variable
It defines the scope of a variable.
The scope is of two types:
◦ Local scope
◦ Global scope
Global is recognized throughout the
program,whereas the local variable scope is
limited to the declaration block
7.
8. Automatic variables
The auto keyword is applied to all
local variables automatically.
It is the default storage class that is
why it is known as automatic variable.
the scope of the variable is local to the
block in which it is defined,available
only to the current block or program.
The vanish after the block of code
finishes executing.
10. Register Variables
The register variable allocates
memory in register than RAM.
It has a faster access than other
variables.
CPU registers are limited,hence
cannot declare more register
variables.
It is recommended to use register
variable only for quick access such as
in counter.
Note: We can't get the address of
12. Static variables
The static variable is initialized only
once and exists till the end of the
program.
It retains its value between multiple
functions call.
The static variable has the default
value 0 which is provided by
compiler,initialised once,it is never
reinitialized.
Can be used to count how many times
14. External Variable
The extern variable is visible to all the
programs.
It is used if two or more files are
sharing same variable or function.
In case in aprogram where both
external and auto variables have been
declared with the same name,the first
priority is given to the auto variable.
Variable defined at other place,other
than the place where it is declared.