1 $ <span class="kw2">gcc</span> f.c <span class="re5">-D</span> <span class="re2">N</span>=5 <span class="sy0">&&</span> .<span class="sy0">/</span>a.out <span class="sy0">||</span> <span class="kw3">echo</span> <span class="re4">$?</span>
3 $ <span class="kw2">gcc</span> f.c <span class="re5">-D</span> <span class="re2">N</span>=4 <span class="sy0">&&</span> .<span class="sy0">/</span>a.out <span class="sy0">||</span> <span class="kw3">echo</span> <span class="re4">$?</span>
4 $ <span class="nu0">24</span>