class ElasticMaterial :public Material
{
public:
	ElasticMaterial(float elasticModulus);
	float getStress(float strain);
private:
	float elasticModulus;
};

ElasticMaterial::ElasticMaterial(float elasticModulus)
{
	this->elasticModulus = elasticModulus;
}

float ElasticMaterial::getStress(float strain)
{
	return strain * this->elasticModulus;
}

class PlasticMaterial :public Material
{
public:
	PlasticMaterial(float elasticModulus, float strainLimit);
	float getStress(float strain);
private:
	float elasticModulus;
	float strainLimit;
};

PlasticMaterial::PlasticMaterial(float elasticModulus, float strainLimit)
{
	this->elasticModulus = elasticModulus;
	this->strainLimit = strainLimit;
}

float PlasticMaterial::getStress(float strain)
{
	if (strain > this->strainLimit)
	{
		return this->strainLimit * this->elasticModulus;
	}
	return strain * this->elasticModulus;
}