2025-10-21 (3 Exc G1): File I/O (Exercise)#

Requirement#

See Exercise: Copy A File for the programming exercise

Create a CMake managed project to build this program (and possibly keep it for future programs of this sort).

Here is an example CMakeLists.txt file for a project where everything is put in the toplevel directory.

CMakeLists.txt#

cmake_minimum_required(VERSION 3.16)
project(ec2-exercises)

# compiler options. (we only check for gcc)
if (${CMAKE_COMPILER_IS_GNUCC})
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0 -g3 -Wall -Werror")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -O0 -g3 -Wall -Werror")
endif()

add_executable(cp-for-the-poor cp-for-the-poor.cpp)

For The New Ones#

Create one dedicated directory for the exercise, say ~/My-Projects/the-new-ones/
Into this directory, put the required minimal set of files: the CMakeLists.txt from above (note that the file is not cp-for-the-poor.cpp, fix that), and a minimal program source file in C++, like
main.cpp#
```
int main()
{
    return 0;
}
```

The directory now should look like follows:

$ tree ~/My-Projects/the-new-ones/
the-new-ones/
├── CMakeLists.txt
└── main.cpp

Create a build directory that is associated with the source directory, like ~/My-Builds/the-new-ones-x86_64
Change into that directory, and create the build Makefile
```
$ cd ~/My-Builds/the-new-ones-x86_64
$ cmake ~/My-Projects/the-new-ones/
...
```
Now you see one Makefile in your build directory (and some other stuff that you can ignore)
Invoke make to do the final build which creates your program.
```
$ make
...
```
Now, if all went well, you should see one file named main (or cp-for-the-poor if you haven’t modified the CMakeLists.txt example from above).