Add new files to the toc.

Author: jrper

_toc.yml

@@ -6,7 +6,8 @@ sections:
   - file: part_one/01_running
   - file: part_one/02_hello_world
   - file: part_one/03_simple_math
-  - file: part_one/04_troubleshooting
+  - file: part_one/04_input-output
+  - file: part_one/05_troubleshooting
   - file: part_one/exercises_one
 - file: part_two/intro
   sections:
@@ -21,6 +22,7 @@ sections:
   - file: part_three/02_structs
   - file: part_three/03_header_files
   - file: part_three/04_build_systems
+  - file: part_three/05_combining_with_python
   - file: part_three/exercises_three
 - file: appendices/intro
   sections:

part_one/01_running.md

@@ -2,7 +2,7 @@
 ```{index} compiling
 ```
 
-Whereas Python is mostly fairly simple to get working with straight away, C & C++ have a few extra hurdles before you can get the computer to run your code. Your program must be compiled (and sometimes linked to other libraries) to produce a separate executable file, before that file can be run. In this section we present a number of ways of approaching this, listed in order of ease of use.
+Whereas Python is mostly fairly simple to get working with straight away, especially in interactive mode, C & C++ have a few extra hurdles before you can get the computer to run your code. Your program must be compiled (and sometimes linked to other external standard or third party libraries) to produce a separate executable file, before that file can be run to solve your problem. In this section we present a number of ways of approaching this, listed in order of ease of use.
 
 ## Web based solutions
 ```{index} compiling:web-based 

part_three/04_build_systems.md

@@ -13,7 +13,13 @@ In general there are two steps involved:
 1. Making sure the  the path for the header files which contain the declarations for the library are available to the compiler
 2. Making sure the path for the library files which contain the compiled code for the library are available to the linker.
 
-How to do this depends on the build system you are using.
+How to do this depends on the build system you are using. We will give a short explanation here, or you can look at the following tutorials for more
+
+
+- [Visual Studio](https://docs.microsoft.com/en-us/cpp/build/walkthrough-creating-and-using-a-dynamic-link-library-cpp?view=msvc-160)
+
+- [Make](https://www.cs.colby.edu/maxwell/courses/tutorials/maketutor/)
+- [CMake](https://cmake.org/cmake/help/latest/guide/tutorial/index.html)
 
 ## Visual Studio (Windows only)