why isn't my code doing anything c++ vscode code example

Example: Visual Studio Code: code not running for C++11

C_Cpp.default.includePath                          : string[]
C_Cpp.default.defines                              : string[]
C_Cpp.default.compileCommands                      : string
C_Cpp.default.macFrameworkPath                     : string[]
C_Cpp.default.forcedInclude                        : string[]
C_Cpp.default.intelliSenseMode                     : string
C_Cpp.default.compilerPath                         : string
C_Cpp.default.cStandard                            : c89 | c99 | c11
C_Cpp.default.cppStandard                          : c++98 | c++03 | c++11 | c++14 | c++17
C_Cpp.default.browse.path                          : string[]
C_Cpp.default.browse.databaseFilename              : string
C_Cpp.default.browse.limitSymbolsToIncludedHeaders : boolean