ref: 0645a868520feb0fac8932b08b6c4e1258b58c0c dir: /tests/execute/0135-unary.c/
int main() { int x; x = 3; x = !x; // 0 x = !x; // 1 x = ~x; // -1 x = -x; // 2 if(x != 2) return 1; return 0; }