Can we display a picture using c language?

Question

Is it valid in C

P = P1 + P2 - P3 

Answer 1

Found the following on the DaniWeb it should help you -

#include <alloc.h>
#include <conio.h>
#include <graphics.h>
#include <stdio.h>
#include <stdlib.h>
struct BMP
{
  char Type[2];           //File type. Set to "BM".
  unsigned long Size;     //Size in BYTES of the file.
  unsigned long Reserved;      //Reserved. Set to zero.
  unsigned long OffSet;   //Offset to the data.
  unsigned long headsize; //Size of rest of header. Set to 40.
  unsigned long Width;     //Width of bitmap in pixels.
  unsigned long Height;     //  Height of bitmap in pixels.
  unsigned int  Planes;    //Number of Planes. Set to 1.
  unsigned int  BitsPerPixel;       //Number of Bits per pixels.
  unsigned long Compression;   //Compression. Usually set to 0.
  unsigned long SizeImage;  //Size in bytes of the bitmap.
  unsigned long XPixelsPreMeter;     //Horizontal pixels per meter.
  unsigned long YPixelsPreMeter;     //Vertical pixels per meter.
  unsigned long ColorsUsed;   //Number of colors used.
  unsigned long ColorsImportant;  //Number of "important" colors.
};

int ShowBMP(int x, int y, char* FileName)
{
    int b,a;
    BMP Obj;
    unsigned char* Datas;
    int in=0;
    unsigned char c=0;
    FILE * fp;
    fp = fopen(FileName,"rb");
    if(!fp){
    printf("Error : Unable to open file ..");
    exit(0);
    }
    fread(&Obj, sizeof(Obj), 1, fp);
    if(Obj.BitsPerPixel!=4)  // This isn't a 16 color bmp we can read;
    {
     fclose(fp);
     printf("Error : File format not supported ..");
     exit(0);
    };
    fseek(fp,Obj.OffSet,SEEK_SET);
    Datas=(unsigned char*) calloc(Obj.Width/2+1, sizeof(unsigned char));
    for(b=Obj.Height;b>=0;b--)
    {
     fread(Datas, sizeof(unsigned char), Obj.Width/2, fp);
     c=0;
     in=0;
     for(a=0;a<=Obj.Width;a+=2)
     {
         c = (Datas[in] | 0x00) >>4;
         putpixel(a+x,b+y,c);
         c = (Datas[in] | 0xF0) & 0x0F;
         putpixel(a+1+x,b+y,c);
         in++;
     }
    }
    free (Datas);
    fclose(fp);
    return 1;
}

void main()
{
int color;
int gd , gm ;
gd = VGA ; gm = VGAHI;
initgraph(&gd,&gm,"");
ShowBMP(0,0,"tune.bmp"); /* Enter File Name Here */
getch();
closegraph();
}