What code or codes can open and display a picture file such as p.png ?

Question

In this lessen it is not clearly mentioned that how you can open and display a picture file which is located in your computer .. the same is true about bin files!

Answer 1

Thank you Martin Taylor
I always include fstream header in all my programs to enable them to make needed changes ..
I took a look at your provided links .. later i am going to work more on it

Answer 2

The current lessen in which i posted this question is a c++ language lesson
I know how to open bin or picture files! There are many tools or applications but if a programmer wants to write a code which can open a picture or bin file .. i mean for example files with exe and or png extensions .. then this lesson which is related to opening files does not help!
Briefly speaking a program with code such as:
open p.png or open(p.png) or openFile p.png will not be able to open a png file!