c language code for image read

We can't just give you code for this: it will depend on what image type you are trying to read:
.JPG internal format is totally different from .BMP for example.
 
C does not have the high-level routines to read an image file - you have to read the file format and process it yourself.
 
Reading the file is easy:

   FILE *input;
   char get_char;
   input = fopen("myimage.bmp", "rb");
   while((get_char=fgetc(input))!= EOF)
      {
      ...
      }
   fclose(input);

Reads a file a byte at a time.
 
You will need to Google for the file format, and process it accordingly.