関連ワード:  warning return with a value in function returning void    warning return with a value in function returning void - wreturn type    warning return with no value in function returning non void    warning return statement with a value in function returning void - fpermissive    return with a value in function returning void    return-statement with a value in function returning 'void' -fpermissive  
結果 : warning return with a value in function returning void