What does inptr do in this code??

Question

Hey guys, can someone please explain what inprt does in this line:
fread(&bf, sizeof(BITMAPFILEHEADER), 1, inptr);
below its used in line 20.

Thank you!

// open input file
FILE *inptr = fopen(infile, "r");
if (inptr == NULL)
{
printf("Could not open %s.\n", infile);
return 2;
}

// open output file
FILE *outptr = fopen(outfile, "w");
if (outptr == NULL)
{
fclose(inptr);
printf("Could not create %s.\n", outfile);
return 3;
}

// read infile's BITMAPFILEHEADER
BITMAPFILEHEADER bf;
fread(&bf, sizeof(BITMAPFILEHEADER), 1, inptr);

// read infile's BITMAPINFOHEADER
BITMAPINFOHEADER bi;
fread(&bi, sizeof(BITMAPINFOHEADER), 1, inptr);

Answer 1

http://www.tutorialdost.com/C-Programming-Tutorial/C-file-io-fread-fwrite-function.aspx

Answer 2

@*Asterisk Thanks for link!