Correlation Coefficient , C++ (gcc)

Correlation Coefficient

//g++  7.4.0

//Correlation Coefficient: finding the value of Karl Pearson's coefficient of correlation
//created by Rezaul Hoque on December 23,2020
//contact at jewelmrh@yahoo.com
#include <iostream>
#include <cmath>
using namespace std;
int main ()
{
int n=10;
float x[n]={50,50,55,60,65,65,65,60,60,50};
float y[n]={11,13,14,16,16,15,15,14,13,13};
float sumX=0,sumXD=0,sumXX=0,sumY=0,sumYD=0,sumYY=0, meanX,meanY, denom,kpcoef,sumXY=0;
for (int i=0;i<n;i++)
{
sumX += x[i];
sumY += y[i];
}
meanX=sumX/n;
meanY= sumY/n;
for (int i=0;i<n;i++)
{
sumXD += (x[i]-meanX);
sumYD += (y[i]-meanY);
sumXX += (x[i]-meanX)*(x[i]-meanX);
sumYY += (y[i]-meanY)*(y[i]-meanY);
sumXY += (x[i]-meanX)*(y[i]-meanY);
}
denom=sqrt(sumXX*sumYY);
kpcoef=sumXY/denom;
cout<<"The Karl Pearson's coefficient of correlation is:\t"<<kpcoef;
cout<<endl;
if (kpcoef>0 && kpcoef >0.5) cout <<"There is high degree of positive correlation between the two variables.\n";
else if (kpcoef>0 && kpcoef <0.5) cout <<"There is low degree of positive  between the two variables.\n";
else if (kpcoef>0 && kpcoef ==1) cout <<"There is perfect positive  between the two variables.\n";

else if (kpcoef<0 && kpcoef > -0.5) cout <<"There is high degree of negative correlation between the two variables.\n";
else if (kpcoef<0 && kpcoef <-0.5) cout <<"There is low degree of negative correlation between the two variables.\n";
else if (kpcoef<0 && kpcoef == -1) cout <<"There is perfect negative correlation between the two variables.\n";
else if (kpcoef==0) cout <<"There is no correlation  between the two variables.\n";
else if (kpcoef>0 && kpcoef== 0.5) cout <<"There is moderate positive correlation  between the two variables.\n";
else if (kpcoef<0 && kpcoef== -0.5) cout <<"There is moderate negative correlation  between the two variables.\n";
else cout<<"Sorry! Not Defined!";
return 0;
}


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