[VladD@Kenga] [10:15:53] [~/c++]
{0,513}$> gcc --version
gcc (GCC) 4.5.3
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


[VladD@Kenga] [10:16:07] [~/c++]
{0,514}$> cat underscore.c
main(a)
{
    printf("%d",a);
}


[VladD@Kenga] [10:16:14] [~/c++]
{0,515}$> gcc -o underscore underscore.c
underscore.c: In function 'main':
underscore.c:3:5: warning: incompatible implicit declaration of built-in function 'printf'

[VladD@Kenga] [10:16:21] [~/c++]
{0,516}$> ./underscore
1
[VladD@Kenga] [10:16:29] [~/c++]
{0,517}$> ./underscore arg1 arg2 arg3
4
[VladD@Kenga] [10:16:33] [~/c++]
{0,518}$>