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Question :

How can C programs run without header files?

Posted by: Rasika on 9/22/2013


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Category C Basics Interview Questions
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Added on 9/22/2013
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Question :

How can C programs run without header files?


Answer:

c programming run without header file
write example given below.
void main()
{
clrscr();
printf("hello");
getch();
}
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Posted by: sujit kumar rout

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If we save our program with .c extention before compiling it, the compiler with automatically include the header files. for eg-
First we save our program with sum.c and then complile it. It will not show any error.
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Posted by: Akansh Tayal

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After compile one time source code with the help of header files then we can again run that prog. without using header files.
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Posted by: AVNEET SINGH

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You cannot run a C program without header files. By default some compilers include header files like stdio.h but in the above program, functions getch() and clrscr() use header files which should be mentioned by the programmer. If the above program should run then the programmer should implement the functions inside the code.
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Posted by: Coolskulll

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The above program will not work.because the getch() is declared in conio.h and printf() require stdio.h .without header files we can't run this program.
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Posted by: Nitin Yadav

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yes a c program runs without including header files..above program would run correctly because by default the c complier includes some header file..so clrscr() and getch() in above program would work without header files..

but in case of c++ it is not so...
there we have to include header files
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Posted by: shreepriya

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we can run C program without includeing header file.
for this after writng code we will have to save the program
after saving the program if we excute it program will work as the compiler will include header file by default.
it will also work in case of c++
eg
void main()
{
int a,b,c;
printf("Enter the values of a and b ");
scanf("%d %d",&a,&b);
c= a+b;
c++
printf("The value is %d",c);
}
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Posted by: Ruchi

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you can run a c program without header files like stdio.h and
conio.h.It is not necessary to save them befor running.
In c++ each header file must be provide by the user execpt the one
below:
main()
{int a,b;
}

if you try to add getch() with out
adding conio.h it will show you error
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Posted by: Neeraj yadav

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In case of c ,, yeah its possible...
The nly thing id u hv to save the program with extension .c, then n only then it woll include some standard header files... lik stdio.h,, conio.h,,,
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Posted by: Ravi Vaghanani

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yes if we save our proram with .c then its include bydefault stdio.h header file so its works as hiddenly
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Posted by: priyankit

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only printf and scanf functions work. Does any other function work without adding the header file?
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Posted by: MOHIT PRADHAN

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The above program will not work.because the getch() Funtion is declared in conio.h and printf()Function is require stdio.h .without header files we can't run this program.



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Posted by: Ajay sachan

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The above program will not work.because the getch() function is declared in conio.h and printf() function require stdio.h .without header files we can't run this program.


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Posted by: Ajay Sachan

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The above program will not work.because the getch()Function is declared in conio.h and printf() Function require stdio.h .without header files we can't run this program.



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Posted by: Ajay Sachan

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This program will not be even compile but if you want to get the output of it so just save it with [.c] extension then it'll compile as well as give you output.
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Posted by: Dipanshu

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