Input using data already output on the screen?
How can I input something that is already output on the console screen. For example, if the code is:
cout << 2 + 2 << endl;
the console screen will show:
4
How can I read this 4 from the OUTPUT screen into a variable?
PS. - I know I can just save it into a variable within the code and not go to the output screen at all, but for some reason I HAVE to read input which is already printed on the screen by the computer.
Thank You.
cout << 2 + 2 << endl;
the console screen will show:
4
How can I read this 4 from the OUTPUT screen into a variable?
PS. - I know I can just save it into a variable within the code and not go to the output screen at all, but for some reason I HAVE to read input which is already printed on the screen by the computer.
Thank You.
You cannot read what is on the screen. At least one cannot do this in a portable manner.
What you can do is redirect where std::cout goes -- send it to a stream that buffers the output (maybe in a stringstream) and also writes it to STDOUT. You can then read back anything that was written to std::cout.
What you can do is redirect where std::cout goes -- send it to a stream that buffers the output (maybe in a stringstream) and also writes it to STDOUT. You can then read back anything that was written to std::cout.
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