汇编的初学问题

.386
.model flat,stdcall
option casemap:none

includelib \masm32\lib\msvcrt.lib
printf PROTO C:DWORD,:VARARG

.data
msg db "Iczelion Tutorial No.2",0 //",0"是干嘛的?

.code

start:
push offset msg
call printf //为啥不输出啊？
add esp,4 //请问下是不是调用几个参数就是4*几？
end start