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Question: Can you write a c program without using main function?

Answer: we can write the programme without main but it can't run becuase linking is from main().



Category C Basics Interview Questions & Answers - Exam Mode / Learning Mode
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Added on 12/19/2013
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Question: Can you write a c program without using main function?
Answer:

we can write the programme without main but it can't run becuase linking is from main(). Source: CoolInterview.com

Answered by: Ameen | Date: 12/20/2008 | Contact Ameen Contact Ameen

yes,we can write c program without using main. Source: CoolInterview.com

Answered by: c.karuppusamy | Date: 12/22/2008 | Contact c.karuppusamy Contact c.karuppusamy

WE CAN WRITE THE PROGRAM WITHOUT MAIN.BUT,IT WILL NOT RUN.BECAUSE,THE COMPILER PERFORMS THE TASK AFTER SEEING THE MAIN FUNCTION ONLY.OTHERWISE,IT SHOWS ERROR. Source: CoolInterview.com

Answered by: k.sangeetha | Date: 1/6/2009 | Contact k.sangeetha Contact k.sangeetha

yes, we can write a c program without using main function. but it'll not be executed as the execution starts from the main function only. Source: CoolInterview.com

Answered by: rashmi | Date: 1/16/2009 | Contact rashmi Contact rashmi

basically,i thought not to post uo solution here but i have seen the same query in many web sites and no proper solution is found
so IM posting here the solution for this tragedic question
1)its true,we can't write a C program without main function
2)IN THIS WORLD NOTHING IS IMPOSSIBLE HEHEHEHE.........
solution:
#include<stdio.h>

#define decode(s,t,u,m,p,e,d) m##s##u##t
#define begin decode(a,n,i,m,a,t,e)

int begin()
{
printf(? hello ?);
}
i listened people who said program will not get executed,DAMN stop such things.if you don't know plz shut your mouths and don't mislead readres plzzzzzzz
the above code works perfectly and if any1 need the explanation for that plz refer www.gohacking.com and in the right most side (below) see C SOURCE CODES coloumn and then read it there clearly.even after that if you have any doubts feel free to contact me at mani.konakandla@yahoo.com Source: CoolInterview.com

Answered by: venkat | Date: 7/6/2009 | Contact venkat Contact venkat

otherwise try this one...

_start()
{
_exit(function_name())
}
void funtion_name()
{
printf("Without main
");
}


and compile this code like this..
$cc -nostartfile source_file.c Source: CoolInterview.com

Answered by: Rao Sahab | Date: 9/20/2009 | Contact Rao Sahab Contact Rao Sahab

yeah ofcourse we can write a c prog without using main().,. but it leads to error in it's execution stage Source: CoolInterview.com

Answered by: lol | Date: 11/12/2009 | Contact lol Contact lol

a program cannot be executed witout a main()function.Since te compiler starts compiling te program after te main() Source: CoolInterview.com

Answered by: sukanya | Date: 12/8/2009 | Contact sukanya Contact sukanya

we can write the code without main() function. The code will gets compiled and during compilation it won't show any error but while executing it show an error saying LINKER ERROR. Source: CoolInterview.com

Answered by: deepak | Date: 12/15/2009 | Contact deepak Contact deepak

Yes we can write a C Program without writing main()

see this

#include<stdio.h>
#include<conio.h>
#pragma start show()

void show()
{
printf("Hello");
}
Source: CoolInterview.com

Answered by: Swesh Mishra | Date: 1/7/2010 | Contact Swesh Mishra Contact Swesh Mishra

yes you can write a program without main but in short just like this

#include<stdio.h>
#include<conio.h>
{
printf("stupids we can do anything");
} Source: CoolInterview.com

Answered by: sanjana | Date: 3/6/2010 | Contact sanjana Contact sanjana

yes we can write c prog without using main() but it will not run because the prog execution always begins with the main() function.
so it will give an error. Source: CoolInterview.com

Answered by: abhinav kumar singh | Date: 3/7/2010 | Contact abhinav kumar singh Contact abhinav kumar singh

The compilation process always starts from the first line of your source code and the compiler checks only syntax, if you don't have a main() not at all a problem. But if you want to execute that you need main(). Check how we are going to create a header file are we going to place a main() in a header file. Source: CoolInterview.com

Answered by: venkatesh | Date: 3/21/2010 | Contact venkatesh Contact venkatesh

No we conn't write c program with out using main().Because it shows error in its run time. Source: CoolInterview.com

Answered by: Latthi.k | Date: 4/3/2010 | Contact Latthi.k Contact Latthi.k

#include<stdio.h>

#define decode(s,t,u,m,p,e,d) m##s##u##t
#define begin decode(a,n,i,m,a,t,e)

int begin()
{
printf(? without main ?);
} Source: CoolInterview.com

Answered by: naresh | Date: 4/13/2010 | Contact naresh Contact naresh

main is not compulsory, every C program needs an entry point so it can be main, pain, slain or anything else, in embedded systems the low level startup code jumps to main, u can change it to something else, similar in visual studio or turbo C u need to find out a compile directive to change the default jump to main.
and to correct the above answers it is not an runtime error, it is linking error Source: CoolInterview.com

Answered by: shrads | Date: 4/20/2010 | Contact shrads Contact shrads

yes, we can write c program without main function ,but this program can't execute without main function.
some errors can you found.
so, boy you write with main...., Source: CoolInterview.com

Answered by: ritu raj | Date: 4/24/2010 | Contact ritu raj Contact ritu raj

Ya it is not possible to execute a C program without main though u can compile it successfully.
Compiler will check for only syntactical errors.
It never bother about whether the main is present in the program or not.
It is possible to execute a program without main in java but not in C. Source: CoolInterview.com

Answered by: Ravinder Reddy | Date: 5/18/2010 | Contact Ravinder Reddy Contact Ravinder Reddy

we can write a c program without main function using PreProcessors.

#define k 5
#define n 12
#if (n>k) printf("n is big campare to k ");
#elif printf("n is small campare to k");
#endif Source: CoolInterview.com

Answered by: Bharat kumar .G | Date: 6/17/2010 | Contact Bharat kumar .G Contact Bharat kumar .G

Hi Friends..

See the above code which is posted by Venkat..That code will works but at there also internally void()methods called by the processor. Source: CoolInterview.com

Answered by: Kiran Kuma Kala | Date: 7/29/2010 | Contact Kiran Kuma Kala Contact Kiran Kuma Kala

yes, we can write but in the linking time it will throw error
undefined reference to main
ld returned one exit status Source: CoolInterview.com

Answered by: iranna | Date: 7/31/2010 | Contact iranna Contact iranna

according to me,program can be written without main() but it will not run because before runing the program compiler will not compile the program without main(). Source: CoolInterview.com

Answered by: vikash chesi | Date: 8/6/2010 | Contact vikash chesi Contact vikash chesi


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