How do I show images in c++

c++ has no inbuilt image display capability - you'll have to use an image library of some description or other. Your choice of library etc. will be governed by your operating system and, to a lesser extent, the compiler you are using. So you'll need to provide us with more information about these for us to be able to give you more precise help.

However, you should search the boards as it's very possible you will find your question has been asked and answered many times before.

Welcome to cprogramming. :)