What I did

CMakeLists.txt

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+project(Class1)
+
+
+include(GNUInstallDirs)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
+
+
+
+add_subdirectory(src)
+add_subdirectory(src2)
+add_subdirectory(src3)
+add_subdirectory(src4)

Plan.md

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+
+
+
+
+
+1. Compiling and Linking
+2. Creating Varaibles and Arrays, C++ symbology
+3. structs, functions, and classes
+4. Templates
+5. Control Flow (loops etc)
+6. ???
+
+
+
+
+
+
+

src/CMakeLists.txt

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+add_executable( TheExecutable main.cpp)

src/Compile.sh

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+#!/bin/bash
+
+mkdir ../build
+mkdir ../build/bin
+
+
+#Don't Use These, These are for intermediate steps
+clang++ -E main.cpp > main.ipp
+clang++ -S main.cpp
+
+#These are the usual routines for compiling
+clang++ -c main.cpp
+clang++ -o TheExecutable main.o
+

src/Makefile

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+# Integrated Makefile for the MONACO software system.
+# Uses file "Makefile.arch" for system specific declarations
+#
+# Last modified April 28, 2004
+
+SHELL = /bin/sh
+
+# Necessary directories
+# MONACOHOME should be an environment variable indicating the top
+# of the monaco distribution tree. 
+BASEDIR=$(PWD)
+
+BINDIR = $(BASEDIR)/../buid/bin
+SRCDIR = $(BASEDIR)
+
+CC=clang
+CXX=clang++
+
+
+
+PROGNAME = TheExecutable
+
+
+
+# Targets...
+
+default : TheExecutable
+
+TARGETS = main.cpp
+OBJS      = $(TARGETS:.cpp=.o)
+# Make the monaco executable and all utilities
+#all :  monaco oxford util
+
+#-lboost;
+
+%.o: %.cpp
+	$(CXX) -c -o $@ $< 
+
+
+TheExecutable : $(OBJS)
+	$(CXX) -o $(PROGNAME) $(OBJS) -lm;
+	rm $(SRCDIR)/*.o
+
+
+# Cleanup options
+
+# Remove object files from directories related to monaco executable
+clean : 
+
+
+
+# Remove all object files, libraries and executables from entire directory tree
+# Basically resets to the original monaco distribution state
+distclean : clean
+	cd $(BINDIR); /bin/rm -f *
+
+# DO NOT DELETE

src/main.cpp

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+
+#include <iostream>
+
+
+
+int main()
+{
+
+    int TestNumber = 98765432;
+
+    std::cout << "Hello, Oh Cruel World\n";
+    std::cout << "The Number is: " << TestNumber << std::endl;
+}

src2/CMakeLists.txt

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+add_executable( TheSecondExecutable main.cpp testfunction.cpp)
+
+target_include_directories(TheSecondExecutable INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>  
+$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}> )

src2/main.cpp

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+
+#include <iostream>
+#include "testfunction.hpp"
+
+
+int main()
+{
+
+    double  TestNumber = 98.765432;
+
+    std::cout << "Hello, Oh Cruel World\n";
+    std::cout << "The Number is: " << TestFunction(TestNumber) << std::endl;
+}

src2/testfunction.cpp

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+
+
+
+#include "testfunction.hpp"
+
+
+double TestFunction(double a)
+{
+    return a * a;
+}

src2/testfunction.hpp

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+#ifndef MPIC_TESTFUNCTION
+#define MPIC_TESTFUNCTION
+
+
+double TestFunction(double a);
+
+
+#endif /* MPIC_TESTFUNCTION */

src3/CMakeLists.txt

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+
+add_subdirectory(library)
+
+add_executable( TheThirdExecutable main.cpp )
+
+target_link_libraries(TheThirdExecutable PUBLIC TheLibrary)

src3/library/CMakeLists.txt

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+add_library( TheLibrary testfunction.cpp)
+
+target_include_directories(TheLibrary INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>  
+$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}> )

src3/library/testfunction.cpp

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+
+
+
+#include "testfunction.hpp"
+
+
+double TestFunction(double a)
+{
+    return a * a;
+}

src3/library/testfunction.hpp

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+#ifndef MPIC_TESTFUNCTION
+#define MPIC_TESTFUNCTION
+
+
+
+double TestFunction(double a);
+
+
+#endif /* MPIC_TESTFUNCTION */
+
+
+

src3/main.cpp

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+
+#include <iostream>
+#include "testfunction.hpp"
+
+
+int main()
+{
+
+    double  TestNumber = 98.765432;
+
+    std::cout << "Hello, Oh Cruel World\n";
+    std::cout << "The Number is: " << TestFunction(TestNumber) << std::endl;
+}

src4/CMakeLists.txt

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+
+add_subdirectory(library)
+
+
+find_package(nlohmann_json QUIET)
+if(nlohmann_json_FOUND)
+  message("json is found at ${Eigen3_DIR}")
+else()
+
+include(FetchContent)
+
+  FetchContent_Declare(
+    json
+    GIT_REPOSITORY https://github.com/nlohmann/json.git
+    GIT_TAG master
+    GIT_SHALLOW TRUE
+    GIT_PROGRESS TRUE)
+
+  FetchContent_MakeAvailable(json)
+
+endif()
+
+
+
+add_custom_target( CopyFile ALL COMMAND ${CMAKE_COMMAND} -E copy_if_different  ${CMAKE_CURRENT_LIST_DIR}/input.json ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/input.json)
+
+
+add_executable( TheFouthExecutable main.cpp )
+
+target_link_libraries(TheFouthExecutable PUBLIC TheSecondLibrary nlohmann_json::nlohmann_json)

src4/input.json

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+{
+    "data": 1.234,
+    "Energy Exchange": [
+      {
+        "Method": "VHS",
+        "Species 1": "Xe",
+        "Species 2": "Xe"
+      },
+      {
+        "Angle Constant 1": -2.02,
+        "Angle Constant 2": 0.0045,
+        "Method": "YHCross",
+        "Species 1": "Xe",
+        "Species 2": "Xe+"
+      }
+    ]
+  }

src4/library/CMakeLists.txt

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+add_library( TheSecondLibrary testfunction.cpp)
+
+target_include_directories(TheSecondLibrary INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>  
+$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}> )

src4/library/testfunction.cpp

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+
+
+
+#include "testfunction.hpp"
+
+
+double TestFunction(double a)
+{
+    return a * a;
+}

src4/library/testfunction.hpp

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+#ifndef MPIC_TESTFUNCTION
+#define MPIC_TESTFUNCTION
+
+
+double TestFunction(double a);
+
+
+
+
+#endif /* MPIC_TESTFUNCTION */