TwoANOVA, C++ (gcc)

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//g++  7.4.0
//Two-factor ANOVA (without replication)
//code is created by Rezaul Hoque on January 17,2021
//please contact at jewelmrh@yahoo.com
#include <iostream>
using namespace std;
int main ()
{
float a[3][4] = {4.5,6.4,7.2,6.7,8.8,7.8,9.6,7.0,5.9,6.8,5.7,5.2};
float sum1=0,sum2=0,sum3=0,sum4=0,sum5=0,sum6=0,sum7=0,sumX=0;
for (int i=0; i<3;i++)
{
for(int j=0;j<4; j++)
sumX += a[i][j];
}

for (int j=0;j<4; j++)
{
sum1 += a[0][j];
sum2 += a[1][j];
sum3 += a[2][j];
}
for (int i=0; i<3;i++)
{
sum4 += a[i][0];
sum5 += a[i][1];
sum6 += a[i][2];
sum7 += a[i][3];
}

//calculate row means and grand mean
float greatX, romean1,romean2,romean3,colmean1,colmean2,colmean3,colmean4;
 romean1 = sum1/4;
romean2 = sum2/4;
romean3 = sum3/4;
colmean1 = sum4/3;
colmean2 = sum5/3;
colmean3 = sum6/3;
colmean4 = sum7/3;
greatX = sumX/12;

float * b = new float[3];
b[0]= romean1;
b[1]= romean2;
b[2]= romean3;
float * c = new float[4];
c[0]=colmean1;
c[1]=colmean2;
c[2]= colmean3;
c[3]= colmean4;
float varB=0,varW=0, varE=0, sumTV=0;
//calculate total variation
for(int i=0;i<3;i++)
{
for(int j=0; j<4; j++)
sumTV += (a[i][j]- greatX)*(a[i][j]- greatX);
}
//calculate variation between columns 
for(int j=0; j<4; j++)
{
varW += (3*((c[j]-greatX)*(c[j]-greatX)));
}
//calculate variation between rows 
for(int i=0;i<3;i++)
{
varB +=( 4*((b[i]-greatX)*(b[i]-greatX)));
}
//calculate variation due to error 
for (int i=0;i<3;i++)
{
for (int j=0;j<4;j++)
varE += (a[i][j]- b[i]- c[j]+greatX)*(a[i][j]- b[i]- c[j]+greatX);
}

//calculate mean squares and F
float meansqB, meansqW,meansqE, theFr,theFc;
meansqB= varB/(3-1);
meansqW = varW/(4-1);
meansqE = varE/((3-1)*(4-1));
theFr = meansqB/meansqE;
theFc = meansqW/meansqE;

cout<<" The row-treatment and column-block look like:\n";
for (int i=0; i<3;i++)
{
for(int j=0;j<4; j++)
cout<<" "<<a[i][j];
cout<<endl;
}

cout<<"The grand mean:\t"<<greatX;
cout<<endl;
cout<<" Total variation is:\t"<<sumTV;
cout<<endl;
cout<<" Variation between rows:\t"<<varB;
cout<<endl;
cout<<" Variation between columns:\t"<<varW;
cout<<endl;
cout <<"Variation due to error:\t"<<varE;
cout<<endl;
cout<<" F value for testing the difference in row means :\t"<< theFr;
cout<<endl;

cout<<" F value for testing the difference in column means :\t"<< theFc;

return 0;
}

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Compilation time: 0.42 sec, absolute running time: 0.14 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,67 sec