So, I’m totally new to c++ but I know there are ways to prevent warnings from causing errors. I’m having the following warning

warning: multi-character character constant [-Wmultichar]
   10 |         std::cout << add(1, 2) << '/n';
      |                                   ^~~~

I just want to complile the code. task.json:

"args": [
                "-fdiagnostics-color=always",
                "-O2",
                "-DNDEBUG",
                "-pedantic-errors",
                "-Wall",
                "-Weffc++",
                "-Wextra",
                "-Wconversion",
                "-Wsign-conversion",
                "-std=c++17",
                "${fileDirname}\**.cpp",
                "-o",
                "${fileDirname}\${fileBasenameNoExtension}.exe"
        ]

How can I do this? I tried adding -Wno-error but to no avail.