Ok, I figured it out. This was due to this: Error VS 2010 - cannot open the file "iostream" ; I just had to change it a bit.
1) Open the properties dialog box. It was not clear to me what this really meant in this answer. I just right-clicked on my project and selected properties.
The right thing is to choose a separate subproject for your decision. After choosing this, move the mouse to the upper left of the solution developer window. When you hover over this icon, you should see "Properties." Open it.
2) Open the directory properties. Select the VC ++ Directories option in the "Configuration Properties" section.
3) - . , : VS 2010 - "iostream" , :
2a) (, ) ""...
2b) Inherit from parent
2c) "". .
2d) "".
2e) ok, .
2f) , . $(ExecutablePath) .
g) , $(ExecutablePath), Include Directories $(IncludePath) ..
h) "", "" .
Intellisense, , .