C / C++ / MFC

#include<stdio.h>
#include<conio.h>
#pragma pack(2)

typedef struct
{
        unsigned short int type;
        unsigned int size;
        unsigned short int reserved1,reserved2;
        unsigned int offset;
}HEADER;

typedef struct
{
        unsigned int size;
        int width,height;
        unsigned short int bits;
        unsigned int compression;
        unsigned int imagesize;
        int xresolution,yresolution;
        unsigned int ncolors;
        unsigned int impcolors;
}INFOHEADER;

typedef struct
{
        unsigned int R,G,B;
}PIXEL;


void main()
{
      HEADER headfirst;
      INFOHEADER headsecond;
      PIXEL pix;
      FILE *fin,*fout,*f1;
      char *read;
      int ch=0,i,j,mat[768],R[256],G[256],B[256],Gray[256];
      float Y[256];
      
      //Read Image Header
      fin=fopen("C:/Dev-Cpp/1.bmp","rb+");
      if(fin==NULL)
      {
                   printf("Error");
                   exit(0);
      }
      fread(&headfirst,sizeof(headfirst),1,fin);
      if(headfirst.type!=19778)
      {
                               printf("Not BMP");
                               getch();
                               return(0);
                               }
      printf("Header %x ",headfirst.type);
      printf("%u ",headfirst.size);
      printf("%u %u ",headfirst.reserved1,headfirst.reserved2);
      printf("%u\n",headfirst.offset); 
      fin=fopen("C:/Dev-Cpp/1.bmp","rb+");         
      fread(&headsecond,sizeof(headsecond),1,fin);

      //Read Image Information Directory
      printf("IFD %u",headsecond.size);
      printf("%d %d %u %u %u %d %d %u %u\n",headsecond.width,headsecond.height,headsecond.height,headsecond.bits,headsecond.compression,headsecond.imagesize,headsecond.xresolution,headsecond.yresolution,headsecond.ncolors,headsecond.impcolors);
      
      //Read Image Pixel Values
      fin=fopen("C:/Dev-Cpp/1.bmp","rb+");
      if(fin==0)
      {return(0);
      }
      for(i=0;i<headfirst.offset;i++)
      {
                                     ch=getc(fin);//Remove Offset
      }
      i=0;
      while ((ch=fgetc(fin))!=EOF)
      {
           mat[i]=(int)ch;
           i++;
      }
     //mat[] gives me the whole array of pixels in the image
     //Now I need to convert that into three arrays... 
      fclose(fin);
      printf("Blue Plane\n");
      i=0,j=0;
      while(i<768)
      {
                  B[j]=mat[i];
                  printf("%3d ",mat[i]);
                  i=i+3;
                  j++;
      }
      printf("\n\n");
      
      printf("Green Plane\n");
      i=1,j=0;
      while(i<768)
      {
                  G[j]=mat[i];
                  printf("%3d ",mat[i]);
                  i=i+3;
                  j++;
      }
      printf("\n\n");
      printf("Red Plane\n");
      i=2,j=0;
      while(i<768)
      {
                  R[j]=mat[i];
                  printf("%3d ",mat[i]);
                  i=i+3;
                  j++;
      }
      printf("\n\n Gray Scale Image\n");
      
      //Now I have the three arrays of RGB
      //Now I need to convert to grayscale
      for(i=0;i<256;i++)
      {
      Y[i]=0.2989 * R[i] + 0.5870 * G[i] + 0.1140 * B[i] ;
      G[i]=(int)Y[i];
      printf("%3d ",G[i]); 
      }
      
      //Write back Grayscale Image as bmp file
      fout=fopen("C:/Dev-Cpp/1.bmp","wb+");
      fwrite(&headfirst,sizeof(headfirst),1,fout);
      fout=fopen("C:/Dev-Cpp/1.bmp","wb+");
      fwrite(&headsecond,sizeof(headsecond),1,fout);
      fout=fopen("C:/Dev-Cpp/1.bmp","wb+");
      for(i=0;i<255;i++)
      {
                        read[i]=(char)G[i];
      }
      read[i]='\0';
      for(i=0;i<255;i++)
      {
                        fwrite (read,sizeof(G),1,fout);
      }
      
      getch();
}