Image informatics in C

#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<string.h>
#include<graphics.h>
struct fh
{
 unsigned int bftype;
 unsigned long bfsize;
 unsigned int bfreserved1;
 unsigned int bfreserved2;
 unsigned long offbits;
}f;

struct in
{
 unsigned long bisize;
 unsigned long biwidth;
 unsigned long biheight;
 unsigned int  biplanes;
 unsigned int bicount;
 unsigned long bicompression;
 unsigned long bisizeimage;
 unsigned long bixpel;
 unsigned long biypel;
 unsigned long biclrusd;
 unsigned long biclrimp;
 }i;


 void main()

 {
   FILE *fp;
 char source[100];
 clrscr();
 printf("\n Enter Source file name:\n");
 gets(source);
 fp=fopen(source,"r+b");

 if(fp==NULL)
 {
 printf("\t Error in opening the file:\n");
 getch();
 }
 fread(&f,sizeof (f),1,fp);
 fread(&i,sizeof (i),1,fp);

 printf("\n FILE TYPE:");
 if(f.bftype==19778)
       {
	printf("\n Its a bitmap file \n");
	}
	else
	{
	printf("\n in vaild file format\n");
	getch();
	}

printf("\n bitype=%d\n",f.bftype);
printf("\n bisize=%ld\n",f.bfsize);
printf("\n bireserved1=%d\n",f.bfreserved1);
printf("\n bireserved2=%d\n",f.bfreserved2);
printf("\n offbits=%ld\n",f.offbits);

  printf("\n bisize=%ld\n",i.bisize);
   printf("\n biwidth=%ld\n",i.biwidth);
 printf("\nbiheight=%ld\n",i.biheight);
 printf("\nbiplanes=%d\n",i.biplanes);
printf("\nbicount=%d\n",i.bicount);
 printf("\n bicompression=%ld\n",i.bicompression);
 printf("\n bisizeimage=%ld\n",i.bisizeimage);
 printf("\n bixpel=%ld\n",i.bixpel);
 printf("\n biypel=%ld\n",i.biypel);
 printf("\n biclrusd=%ld\n",i.biclrusd);
 printf("\n biclrimp=%ld\n",i.biclrimp);

getch();
}