为什么0分？

#include<iostream>
using namespace std;
int t,a[101010],ans;
int main(){
    cin>>t;
    for(int i=1;i<=t;i++){
        cin>>a[i];
        for(int j=1;j<=a[i];j++){
            ans++;
            if(j%10==7 || j%100==7 || j%1000==0 || j%10000==0 ||j%100000==0 || j%1000000==0 || j%10000000==0 || j%100000000==0) ans--;
            if(j==a[i]){
                cout<<ans<<endl;
                ans=0;
            } 
        }
    }
    return 0;
}