task.json

{
    "version": "2.0.0",
    "tasks": [
        {
            "taskName": "compile and run C",
            "type": "shell",
            "command": "g++ ${file} -o ${fileBasenameNoExtension}.out && ./${fileBasenameNoExtension}.out ",
            "presentation": {
                "reveal": "always",
                "panel": "shared"
            },
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "preLaunchTask": "build hello world"
        }
    ]
}