snippet hio "include stdio.h" iA
#include <stdio.h>
endsnippet

snippet hlib "include stdlib.h" iA
#include <stdlib.h>
endsnippet

snippet hmath "include math.h" iA
#include <math.h>
endsnippet

snippet hstr "include string.h" iA
#include <string.h>
endsnippet