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

The header files are only needed whenever u r using the pre-defined functions which belongs to those libraries which has to be included.

eg. #include<stdio.h>
will allow u to use printf() and scanf().

Because of this reason is whenever we are going to run any c program without header file,it may not be connected input output library file. So it will effect internally to the program.

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