/in/foo.cc: In function 'int main()':
/in/foo.cc:9:17: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
    scanf("%d", w);
                 ^
/in/foo.cc:12:14: warning: conversion lacks type at end of format [-Wformat=]
    scanf("%*");
              ^