int main () {
if ( fork () != 0) {
if ( fork () != 0) {
} else {
fork () ;
}
} else {
if ( fork () != 0) {
} else {
fork () ;
}
printf (" hello4 \n") ; // <-- this one ! }
}
aW50IG1haW4gKCkgewoJaWYgKCBmb3JrICgpICE9IDApIHsKCQlpZiAoIGZvcmsgKCkgIT0gMCkgewoJCQlwcmludGYgKCIgaGVsbG8xIFxuIikgOwoJCX0gZWxzZSB7CgkJCWZvcmsgKCkgOwoJCX0KCQlwcmludGYgKCIgaGVsbG8yIFxuIikgOwoJfSBlbHNlIHsKCQlpZiAoIGZvcmsgKCkgIT0gMCkgewoJCQlwcmludGYgKCIgaGVsbG8zIFxuIikgOwoJCX0gZWxzZSB7CgkJCWZvcmsgKCkgOwoJCX0KCQlwcmludGYgKCIgaGVsbG80IFxuIikgOyAvLyA8LS0gdGhpcyBvbmUgIQoJfQoJcHJpbnRmICgiIGhlbGxvNSBcbiIpIDsKfQ==