Skip to main content

How to create a Header File in C Language or In C How to make User Defined Header Files

How to create a Header File in C Language or In C How to make User Defined Header Files :-

First we have to install or copy Turbo C++ in our computer. If we copy the TC folder, which should be copied into the same Drive as the Source Computer Drive, otherwise an Error will occur see more.

Any way let us guess the C Program in "C:\TC\BIN\TC.EXE"

then usually the Header files residing in "C:\TC\INCLUDE\" directory.

our working directory is "C:\TC\BIN\"

Let us try How to create a "Hello World!" Program with clrscr() SDF :-

#include<stdio.h>
#include<conio.h>

void main()
{
clrscr();
printf("Hello World!");
}

in the above program, we used clrscr() as a System Defined Function, because it is defined in conio.h and it is included.

Let us try How to create a "Hello World!" Program with clrscr() as UDF and User Defined Header File :-

Step 1:
fist let us make a header file named "my_header_file.h" and its contents given below

#include<stdio.h>
#include<conio.h>
void clrscr(void)
{
int i;
gotoxy(1,1);
for(i=1;i<=25;i++)
{
printf("\n");
}
gotoxy(1,1);
}

save as in the location mentioned above "C:\TC\INCLUDE\my_header_file.h"

header file creation over

Step 2:

now create our C file named "my_c_file.c"

#include<stdio.h>
#include<my_header_file.h>
main()
{
clrscr();
printf("Hello World!");
}

save as in the location mentioned above "C:\TC\BIN\my_c_file.c"

in the above program, we used clrscr() as a User Defined Function, it is defined in the header file my_header_file.h and it is included instead of conio.h.

Now let us see the real thing. just Run "C:\TC\BIN\my_c_file.c"
output will be:

Hello World!

Note:

1) if we save our header in "C:\TC\INCLUDE\" it should be included as #include<my_header_file.h>

2) if we save our header in "C:\TC\BIN\" it should be included as #include"my_header_file.h"
Labels:

Popular posts from this blog

Binary to Decimal Conversion in C, C Program for Binary to Decimal

Binary to Decimal Conversion in C or C Program for Binary to Decimal Number? #include<stdio.h> #include<conio.h> void main() {         long int b_n,d_n=0,j=1,rem;     clrscr();     printf("Enter a binary number: ");     scanf("%ld",&b_n);     while(b_n!=0)    {         rem=b_n%10;                    d_n=d_n+rem*j;         j=j*2;         b_n=b_n/10;     }     printf("Equivalent decimal Number : %ld",d_n);     getch(); } Output: Enter a Binary Number : 101 Equivalent Decimal Number : 5
Read more

Swapping of Two Numbers in C or C Program to Swap Two Numbers

Swapping of Two Numbers in C or C Program to Swap Two Numbers or C program to Swap two numbers without using a third variable #include <stdio.h> #include <conio.h>  void main() {    int x, y, temp;    clrscr();    // to clear screen       printf("Enter the value of x and y\n");    scanf("%d%d", &x, &y);    printf("Before Swapping\nx = %d\ny = %d\n",x,y);    temp = x;    x    = y;    y    = temp;    /*       without using temp variable, this can be used    let x=4 and y=5    x = x + y ;   x=x+y => x=4+5 => x=9     y = x - y ;   y=x-y => y=9-5 => y=4  value changed    x = x - y ;   x=x-y => x=9-4 => x=5  value changed      */       printf("After Swapping\nx ...
Read more

C Program to find Prime Number using UDF, also find Prime Numbers upto a limit in C Language

C Program to find Prime Number using UDF, also find Prime Numbers upto a limit in C Language: Example 1 : C Program to find prime number using user defined function :- #include<stdio.h> #include<conio.h> int primeNumber(int); /* function declaration or prototype, int arg int returns */ void main() { int num,prime; clrscr(); printf("Enter an integer Number :"); scanf("%d",&num); prime = primeNumber(num); /* function call here with Actual Parameter num, rtns integer value and assigning to the var prime */ if(prime==1) printf("%d is a prime number",num); else printf("%d is not a prime number",num); getch(); } int primeNumber(int n) /* function definition with Formal Parameter n and returns an integer */ { int i; for( i=2 ; i<=n/2 ; i++) { if(n%i==0) return 0; } return 1; } /* prime number 3,7,11,17.... */ Example 2 : C Program to find prime num...
Read more