hey...i am getting Run time error.....plzz...help...though using Sieve my code is

include<iostream>

include<math.h>

using namespace std; int main() { int a,b,c,i,j,k,d,u; float g;

cin>>d; for(k=0;k<d;k++) {

cin>>u;
cin>>a;

g=a; bool m[a]; for(i=2;i<=a;i++) { m[i]=true; }float z;int q; z=sqrt(g);

for(i=2;i<=z;i++) { if(m[i]==true) { for(j=0;;j++) { q=(ii)+(ji); if(q<=a) m[q]=false; else break; } }

} for(i=2;i<=a;i++) { if((m[i]==true)&&(i>=u))
cout<<i<<"\n"; }
cout<<"\n"; }
return 0;

}