How I give input in form of c++ program ?

If we want to run whole c++ program in a place where input is required?

Or how I give input in form of c++ programme.

What exactly do you want to do? Can you explain your question so that it's easier for us to understand what you are doing and at what step are you stuck?

Means I want to Make a program which outputs a value and that output I want to used as a input to a field where input is required. 

I want to create a program which predicts a 3 digit pasward