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

Posted by: mohammed nawaz on 12/19/2013

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Category C Basics Interview Questions
Rating (4.0) By 69 users
Added on 12/19/2013
Views 715
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we can write the programme without main but it can't run becuase linking is from main().

Posted by: Ameen

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yes,we can write c program without using main.

Posted by: c.karuppusamy

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Posted by: k.sangeetha

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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.

Posted by: rashmi

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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

#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 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

Posted by: venkat

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otherwise try this one...

void funtion_name()
printf("Without main

and compile this code like this..
$cc -nostartfile source_file.c

Posted by: Rao Sahab

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

Posted by: lol

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

Posted by: sukanya

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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.

Posted by: deepak

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

see this

#pragma start show()

void show()

Posted by: Swesh Mishra

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

printf("stupids we can do anything");

Posted by: sanjana

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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.

Posted by: abhinav kumar singh

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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.

Posted by: venkatesh

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

Posted by: Latthi.k

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#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 ?);

Posted by: naresh

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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

Posted by: shrads

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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....,

Posted by: ritu raj

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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.

Posted by: Ravinder Reddy

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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");

Posted by: Bharat kumar .G

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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.

Posted by: Kiran Kuma Kala

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

Posted by: iranna

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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().

Posted by: vikash chesi

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