/in/foo.cc: In function 'int main()':
/in/foo.cc:29:39: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     while(scanf("%d%d%d", &a, &b, &c) && (a + 1) || (b + 1) || (c + 1))  
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~