Magic Square | Solution

(for solution with indenting see pdf)

//Assignment - Magic Square

//simple code version

//author: Professor

//last compiled: March 16, 2015

#include <iostream>

using namespace std;

int const Maxsize=10;

int main(){

int inmatrix[Maxsize][Maxsize]; // array to hold data

int ndim; // dimension

int i,j; // index variables

int testsum, sum, tempsum;

bool ismagic;

// read size of matrix

cout << "Dimension of data matrix is = "; cin >> ndim;

// read matrix

for (i=0; i<ndim ; i++){

cout << "values in row " << i+1 << " are? " << endl;

for (j=0; j<ndim; j++){

cout << "value " << j+1 << "? "; cin >> inmatrix[i][j];

}}

//echo print matrix input

cout << "Your square:\n";

for (i=0; i<ndim ; i++){

for (j=0; j<ndim; j++)

cout << inmatrix[i][j];

cout << endl;

}

// now test if magic square

// get sum of first row

sum=0;

for (j=0 ; j< ndim ; j++)

sum += inmatrix[0][j];

// test rows

ismagic= true;

for (i=1; i< ndim; i++){

tempsum=0;

for (j=0 ; j< ndim ; j++)

tempsum += inmatrix[i][j];

if (tempsum != sum) ismagic=false;

}

// now test cols

for (j=0; i< ndim; j++){

tempsum=0;

for (i=0 ; i< ndim ; i++)

tempsum += inmatrix[i][j];

if (tempsum != sum) ismagic=false;

}

// now diag 1

testsum=0;

for (i=0; i< ndim; i++)

testsum += inmatrix[i][i];

if (testsum != sum)

ismagic=false;

// now diag 2

testsum=0;

for (i=0; i< ndim; i++)

testsum += inmatrix[i][ndim-i-1];

if (testsum != sum)

ismagic=false;

if (ismagic)

cout << "\n Matrix is a magic square \n\n";

else

cout << "\n Matrix is not a magic square \n\n";

return 0;

}