is-div-by-3

Takes an input from the stdin, checks if the given input is dividable by 3. Reads buffer until it hits \n or \0.

Build

Execute the following commands to build a release version.

$ cmake -DCMAKE_BUILD_TYPE=Release -B cmake-build-release -S .
$ cmake --build cmake-build-release

Run

The program is stored in the ${CMAKE_CURRENT_BINARY_DIR}/bin. In our case it's ./cmake-build-release/bin.

$ print "1234123412343" | ./cmake-build-release/bin/is-div-by-3
The given input is accepted.