C ++整数部分的数量非常多

Question

so I'm currently writing an assignment for my data structures class that's giving me a headache in the most basic place possible. We're working on the Hungtington-Hill method in conjunction with priority queues, and when I try and do my simple division to get the "priority" which is equal to the population of a state divided by the geometric mean, I'm getting really large numbers. The vars and method inside my state class look like this:

class State{
 private:
    string state;
    int pop;
    int reps;
    double priority;
};
void State::calculatePriority(){
    double temp = (double)reps * ((double)reps + 1.0);
    priority = (double)pop/sqrt(temp);
}

The method calculatePriority() gives me crazy output, where it'll read in like this:

State: California

2010 Census Population: 37253956

Representatives: 1

Priority: 0

And post calculatePriority() I get this:

State: California

2010 Census Population: 37253956

Representatives: 1

Priority: 2.63425e+07

Is there a logical mistake I'm making here? I'm not sure what the issue is. It may be with the sqrt() method I am not sure. I at first thought it was because of the (double) cast, so I changed all the vars to doubles, but I encountered the same issue.

Answer 1

The result is not that large, it's actually 2.63425e+07 ≈ 26342524 , which is the exact result of your calculation:

double temp = (double)reps * ((double)reps + 1.0); // = 2
priority = (double)pop/sqrt(temp); // = (37253956 / 1.41421) = 26342524

There is nothing wrong with your program :)