要做一个检测范围内素数数量的程序，但是输出的数据总是不对

哪里出了问题？求解答

#include <iostream>

using namespace std;

int main()
{
    int start,ending,test,number=0;
    cin >> start >> ending;
    test=ending-1;
    while(ending!=start)
    {
        while(test!=2)
        {
            if(ending%test==0)
            {
                number++;
                break;
            }
            test=test-1;
            cout << test << " " << number << endl;//-
        }
        cout << ending << endl;//-
        ending=ending-1;
        test=ending-1;
    }
    cout << number << endl;
    return 0;
}