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  • INTERVIEW QUESTIONS C C BASICS DETAILS
    Question :
    How can C programs run without header files?

    Posted by: Rasika on 9/22/2008

    Contact Rasika Contact Rasika
    Category C Basics Interview Questions
    Rating (0.4) By 1479 users
    Added on 9/22/2008
    Views 2095
    Rate it!
    Answers:

    c programming run without header file
    write example given below.
    void main()
    {
    clrscr();
    printf("hello");
    getch();
    }



    Posted by: sujit kumar rout    

    Contact sujit kumar rout Contact sujit kumar rout

    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.



    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.



    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.



    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.



    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



    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);
    }



    Posted by: Ruchi    

    Contact Ruchi Contact Ruchi

    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



    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,,,



    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



    Posted by: priyankit    

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    only printf and scanf functions work. Does any other function work without adding the header file?



    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.




    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.



    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.




    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.



    Posted by: Dipanshu    

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    Yes, It'll run ....because by default C compier adds header files to the code when its object file is created "prog_name.obj"

    But keep in my mind it need to save 1st with ".c" extension bcz without saving the noname.cpp uses CPP compiler that cannot do so...



    Posted by: Rohit    

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    A program can run without including .h files, only if your program contains no predefined library calls like printf ,scanf and others like malloc included. You have to implement your own program for this predefined library.This will be helpful only for small programs.




    Posted by: Sri    

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    if we write a program without main function the program will compile without error but during the run time the compler will search for main function so it will not display the output



    Posted by: saravanan    

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    without header file no c program can execute. If we write a c code with out header file and save it with .c extension the compiler will automatically include the header files.
    e.g:

    void main()
    {
    printef("hello"):
    }

    will run with no error if we name it as sample.c first then compile



    Posted by: Rana Sardar    

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    we write a c program witout using header file.The program work properly ,because we save a program with .c before compile the program it will work.bydefaut compiler have a stdio.h and conio.h header file's



    Posted by: Nandlal    

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    We cam write a program with out header file please follow it
    $ gedit main.c
    write the below program

    void main()
    {
    if(printf("This is test")){}
    }
    save and quit gedit

    [Basanta@localhost trial]$ gcc main.c
    main.c: In function ?main?:
    main.c:3:4: warning: incompatible implicit declaration of built-in function ?printf?
    [Basanta@localhost trial]$ ./a.out

    you will get the output



    Posted by: Basanta Kumar Sethi    

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    without header files we can run c program.if you save your progarm .c before compilation then header file is not require,and you compile your program whitout save then error occur and in this condition you written header files.



    Posted by: Amit joshi    

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    If you are saving your file with .c extension then compiler automatically includes the require header files, but this would not work in case of file saved with .cpp extension.



    Posted by: Neelesh Pathak    

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    We can't run a c program with-out Header file. but we run it an another process.



    Posted by: Gobinda Chakraborty    

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    without header files we can run c program.if you save your progarm .c before compilation then header file is not require,and you compile your program whitout save then error occur and in this condition you written header files.



    Posted by: satheesh     

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    It will not compile the program without using the header file, if we are saving the file with .CPP extension.



    Posted by: shradha sardesai    

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    yes, any c program can run without header files, by directly using the assembly language support,which can be effectively used to replace the standard functions.

    e.g in Turbo C++

    void main()
    { char *ch="Hi!.How are you?$"
    asm{
    push ax;
    push dx;
    mov dx,[&ch];
    mov ah,0x09;
    int 0x21;
    pop dx;
    pop ax;
    }
    }

    and the output is:
    Hi!.How are you?



    Posted by: Rounak    

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    yeh..its really working..thanx. it helped me a lot..



    Posted by: jyotsna sharma    

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    if we save the programm with .ccp extension ....then the programm will be run without header file.....



    Posted by: MUKESH gUPTA    

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    yes it is very easy to written a programme without header file...
    main()
    {
    int a,b,c;
    a=5;
    b=5;
    c=a+b;
    printf("%d",c);
    }



    Posted by: Deepak bhola     

    Contact Deepak bhola Contact Deepak bhola

    hello guys , ijust wanna say 2 posssibilities--
    1.our os is made in c,,so there are predefined compilers-
    2.there are many compilers which use predefined header files



    Posted by: mukix    

    Contact mukix Contact mukix

    yes in class of c, this program will work fine .coz the complier itself by default add the header files like stdio.h and conio.h .but in case of c++ the program is non executable it will ask for the prototype.



    Posted by: nav    

    Contact nav Contact nav

    the above program will work correctly if the program is saved with filename.c ,.c extension is required if you don't want to include headerfile,if you make .cpp extension this program will give error during compilation.



    Posted by: sonu    

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