mtrapier@dev2 ~/temp $ cat > test.c << EOF
> void main()
> {
> printf("Hello World");
> }
>
> EOF
mtrapier@dev2 ~/temp $ gcc test.c -o test
test.c: In function `main':
test.c:2: warning: return type of `main' is not `int'
mtrapier@dev2 ~/temp $ ./test
Hello Worldmtrapier@dev2 ~/temp $