ch-01-ex-04-solution.cpp
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ch-01-ex-04-solution.cpp
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			/*
			* exercise04.cpp
			*
			* Declared four 2x2 floating point matrices A, B, C, D and computes:
			* C = A + B and D = AB
			*
			* Created on: Jul 26, 2012
			* Author: Radu Popescu <radu.popescu@epfl.ch>
			*/

			#include <iostream>

			int main(int argc, char *argv[]) {
			// Declare A and assign values to it
			double A[2][2];
			A[0][0] = 0.5;
			A[0][1] = 2.0;
			A[1][0] = 1.5;
			A[1][1] = 4.0;

			// Declare B and initialize it at the same time
			double B[2][2] = {{5.0, 2.5}, {3.5, 7.5}};

			double C[2][2];
			double D[2][2];

			// Compute the values of C
			C[0][0] = A[0][0] + B[0][0];
			C[0][1] = A[0][1] + B[0][1];
			C[1][0] = A[1][0] + B[1][0];
			C[1][1] = A[1][1] + B[1][1];

			// Compute the values of D
			D[0][0] = A[0][0] * B[0][0] + A[0][1] * B[1][0];
			D[0][1] = A[0][0] * B[0][1] + A[0][1] * B[1][1];
			D[1][0] = A[1][0] * B[0][0] + A[1][1] * B[1][0];
			D[1][1] = A[1][0] * B[0][1] + A[1][1] * B[1][1];

			// Print the results
			std::cout << "The matrix C is: " << std::endl
			<< C[0][0] << " " << C[0][1] << std::endl
			<< C[1][0] << " " << C[1][1] << std::endl;
			std::cout << "The matrix D is: " << std::endl
			<< D[0][0] << " " << D[0][1] << std::endl
			<< D[1][0] << " " << D[1][1] << std::endl;

			return 0;
			}