The vimrc file I am using

.vimrc

set hlsearch
set incsearch
set ic
set expandtab
set shiftwidth=4
set tabstop=4
set laststatus=2
set statusline=%f
set autoindent
set tags=tags;/
set statusline="%f%m%r%h%w [%Y] [0x%02.2B]%< %F%=%4v,%4l %3p%% of %L"
set background=dark
set relativenumber
set number

fun! ShowFuncName()
  let lnum = line(".")
  let col = col(".")
  echohl ModeMsg
  echo getline(search("^[^ \t#/]\\{2}.*[^:]\s*$", 'bW'))
  echohl None
  call search("\\%" . lnum . "l" . "\\%" . col . "c")
endfunction
map <C-f> :call ShowFuncName() <CR>

function! HeaderToggle()
    let filename = expand("%:t")
    if filename =~ ".cpp"
        execute "e %:r.h"
    else
        execute "e %:r.cpp"
    endif
endfunction
map <C-a> :call HeaderToggle() <CR>

function! SaveSession()
    execute ":mksession! ~/.vimsession"
endfunction
map <C-w> :call SaveSession() <CR>

function! ToggleLineNumber()
    if &number || &relativenumber
        execute "set nonumber"
        execute "set norelativenumber"
    else
        execute "set number"
        execute "set relativenumber"
    endif
    execute
endfunction
map <C-n> :call ToggleLineNumber() <CR>