/in/foo.cc:4:16: error: size of array 'ispr' has non-integral type 'double'
 bool ispr[1e8+5];
                ^
/in/foo.cc:5:13: error: size of array 'pr' has non-integral type 'double'
 int pr[1e8+5],n,num=1,tp=0,prtot;
             ^