/in/foo.cc: In function 'int main()':
/in/foo.cc:7:18: warning: for increment expression has no effect [-Wunused-value]
     for(i=0;i++;i<n)
                 ~^~
/in/foo.cc:9:18: warning: for increment expression has no effect [-Wunused-value]
     for(i=0;i++;i<n+1)
                 ~^~~~
/in/foo.cc:10:22: warning: for increment expression has no effect [-Wunused-value]
       for(j=i+1;j++;j<n)
                     ~^~
/in/foo.cc:16:18: warning: for increment expression has no effect [-Wunused-value]
     for(i=0;i++;i<n)
                 ~^~
/in/foo.cc:18:18: warning: for increment expression has no effect [-Wunused-value]
     for(i=0;i++;i<n)
                 ~^~