ハッカソンの順位とチーム数から偏差値を求めるプログラム

HackathonAnalysis.cpp

#include <iostream>
#include <math.h>

float GetAverageRank(int teamNum)
{
    float sum = 0;
    for(int i=1; i<=teamNum; ++i)
    {
        sum += i;
    }
    return sum/teamNum;
}

float GetStandardDeviation(int teamNum, float average)
{
    float sum = 0;
    for(int i=1; i<=teamNum; ++i)
    {
        sum += powf(i-average, 2);
    }
    return sqrtf(sum/teamNum);
}

float GetDeviation(int rank, int teamNum)
{
    float average = GetAverageRank(teamNum);
    float standardDeviation = GetStandardDeviation(teamNum, average);
    return -(((rank-average)*10)/standardDeviation) + 50;
}

int main()
{
    while(true)
    {
        std::string eventName;
        int rank,teamNum;
        std::cout << "イベント名:";
        std::cin >> eventName;
        std::cout << "順位:";
        std::cin >> rank;
        std::cout << "参加チーム数:";
        std::cin >> teamNum;
        std::cout << eventName << "での偏差値は" << GetDeviation(rank,teamNum) << std::endl;
    }
}