/in/foo.cc: In function 'int main()':
/in/foo.cc:19:16: warning: statement has no effect [-Wunused-value]
         tolower(a[i]);
         ~~~~~~~^~~~~~
/in/foo.cc:23:16: warning: statement has no effect [-Wunused-value]
         tolower(b[i]);
         ~~~~~~~^~~~~~
/in/foo.cc:27:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if (i==0||i>0&&b[i-1]==' ')
             ~~~^~~~~~~~~~~~~