What are different between declaration & definition?

Asked by Last Modified  

4 Answers

Learn C Language

Follow 0
Answer

Please enter your answer

Declaration means defining the variable or function. Definition means group of instruction or group of statement to be performed when function is call. It defined the task of function.
Comments
Dislike Bookmark

A declaration introduces an identifier and describes its type, be it a type, object, or function. A declaration is what the compiler needs to accept references to that identifier. These are declarations: extern int bar; extern int g(int, int); double f(int, double); // extern can be omitted for...
read more
A declaration introduces an identifier and describes its type, be it a type, object, or function. A declaration is what the compiler needs to accept references to that identifier. These are declarations: extern int bar; extern int g(int, int); double f(int, double); // extern can be omitted for function declarations class foo; // no extern allowed for type declarations A definition actually instantiates/implements this identifier. It's what the linker needs in order to link references to those entities. These are definitions corresponding to the above declarations: int bar; int g(int lhs, int rhs) {return lhs*rhs;} double f(int i, double d) {return i+d;} class foo {}; A definition can be used in the place of a declaration. An identifier can be declared as often as you want. Thus, the following is legal in C and C++: double f(int, double); double f(int, double); extern double f(int, double); // the same as the two above extern double f(int, double); read less
Comments
Dislike Bookmark

GATE Qualified

Declaration tells the compiler the presence of a variable named so and so in the program. Definition assigns the memory address to the variable. The best example of declaration and definition is: struct var { int a; char b; }; This is only declaration because no object is created of var type. Whereas,...
read more
Declaration tells the compiler the presence of a variable named so and so in the program. Definition assigns the memory address to the variable. The best example of declaration and definition is: struct var { int a; char b; }; This is only declaration because no object is created of var type. Whereas, If we do int x; in main() function, then it is declaration and definition as well because compiler gets to know about x and memory location is also assigned to x. read less
Comments
Dislike Bookmark

Thanks for the question Rajinder...... Declaring a variable means to inform the compiler that the variable is declared of this data type. Variable definition means to ask the compiler for memory. Thanks, Team DishaaPro www.dishaapro.com
Comments
Dislike Bookmark

View 2 more Answers

Related Questions

Can anybody provide me error free coding for graphic program in C??? Animated Smiley program Rotating Fan progran Sunrise program
#include graphics.h #include conio.h #include stdlib.h #include dos.h main() { int gd = DETECT, gm,area,temp1,temp2,left =25,top=75; void *p; initgraph(&gd,&gm,”C:\TC\BGI”); setcolor(YELLOW); circle(50,100,25); setfillstyle(SOLID_FILL,YELLOW); floodfill(50,100,YELLOW); setcolor(BLACK); setfillstyle(SOLID_FILL,BLACK); fillellipse(44,85,2,6); fillellipse(56,85,2,6); ellipse(50,100.205,335,20,9); ellipse(50,100.205,335,20,10); ellipse(50,100.205,335,20,11); area...
Gayu
0 0
View Comments8
Is it necessary to mention the header files in the C programming language?
It is absolutely necessary as without inclusion of the same to your program, will lead to the absence of library functions that are present in the header files, your program will have a syntax error.
Hari
What is the cost of the course?What kind of questions are asked for interviews from C language??
Most questions are from Pointers
Chandana
when will you start for delivering lectures on C language
You can approach, I will teach in depth, make you profession c developer
Surbhi
Why C language is still available in market, while so many & much easier languages are available ?
Now, I agree that you can use OOP in C to some extent, but it's sort of painful and inelegant (well at least compared to C++ I guess). So, what makes C so popular? Is it efficiency; being low-level; the...
Pankaj

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

C Language
To get help in C window (for keywords, functions) press Alt +F1.To delete a single line , use the shortcut key CTRL +Y.If you got error about the path when you execute a C pgm, check the Options menu =>Directories.
T

Thilagam S.

0 0
View Comments0
C Program-Upper Case Demo
/*WAP to print the character entered by user in upper case*/ //Header files #include<stdio.h>#include<conio.h> //Main function void main(){ char ch; //Function for clearing screen clrscr(); ...

Salim Ahmed Ansari

0 0
View Comments0
Tress And Its Traversal
Depth First Traversals:(a) Inorder (Left, Root, Right) : 4 2 5 1 3(b) Preorder (Root, Left, Right) : 1 2 4 5 3(c) Postorder (Left, Right, Root) : 4 5 2 3 1 Trees are one of the data structures like...

Sunil Yadav

1 0
View Comments0
Efficient Learning Strategies
Type your notes after class Write your notes onto flashcards - Scrabble -Make posters Review flashcards while walking, at gym, etc. Dog-ear pages in the reading where you can find...

Vijith V T

1 0
View Comments0
Programing Languages Learning Tricks
You want to learn that new language or library or framework as soon as possible, right? That’s understandable. Fortunately, there are a handful of tips that can help you to better retain all of that...
H

Harshal G.

0 0
View Comments0

Recommended Articles

Brilliant Academy, a reputed B. Tech Tuition...

Brilliant Academy is one of the reputed institutes for B.Tech tuition classes. This institute is specialised in delivering quality tuition classes for B.E, Engineering - all streams and Engineering diploma courses. Incorporated in 2012, Brillant Academy is a brainchild of Mr Jagadeesh. The main motto of the academy is to...

Read full article >

Lasya Infotech: An educational Training...

Lasya Infotech is a Hyderabad based IT training institute founded in 2016 by O Venkat. Believing in his innovation, passion and persistence and with a diverse blend of experience, he started his brainchild to deliver exemplary professional courses to aspiring candidates by honing their skills. Ever since the institute envisions...

Read full article >

Why Should you Become an IT Consultant

Information technology consultancy or Information technology consulting is a specialized field in which one can set their focus on providing advisory services to business firms on finding ways to use innovations in information technology to further their business and meet the objectives of the business. Not only does...

Read full article >

Make a Career in Mobile Application Programming

Almost all of us, inside the pocket, bag or on the table have a mobile phone, out of which 90% of us have a smartphone. The technology is advancing rapidly. When it comes to mobile phones, people today want much more than just making phone calls and playing games on the go. People now want instant access to all their business...

Read full article >

Find C Language Classes near you
C Language Classes in Bangalore
C Language Classes in Hyderabad
C Language Classes in Delhi
C Language Classes in Pune
C Language Classes in Chennai
C Language Classes in Mumbai
C Language Classes in Kolkata
C Language Classes in Noida
C Language Classes in Ghaziabad
C Language Classes in Gurgaon

Looking for C Language Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you