Afficher des float sous un format specifique

double GetDecExp(int nDec)
{	
	double dRet;
	double ad[6]={1.,10.,100.,1000.,10000.,100000.};
 
	if(nDec>=0 && nDec<=5) return(ad[nDec]);
	dRet=ad[5];			
	for(int i=1;i<nDec-4;i++) dRet*=10.;
	return floor(dRet);
}
 
double Roundn(double dValue,int nDecimales)
{
	if (nDecimales<0 || dValue==0.) return(dValue);
 
	double dSeuil =(dValue<0.?-.5:.5);
 
	double dExp=GetDecExp(nDecimales);
 
 	double dCalc = (((dValue*dExp)+dSeuil));
 
	if(dValue<0.)
		return(ceil(dCalc)/dExp);
	else		
		return(floor(dCalc)/dExp);
}

int Cal::CalcTab()
{
  int X;

for (unsigned int Y = 10; Y < 60; Y++)
  {
    X = 10;
    for (int i = 0; i < 5; i++)
      {
        this->_Tab.push_back(Stati(X, Y));
        X += 10;
      }
    this->_Tab.push_back(CalcTotalY());
    Y += 10;
  }
  CalcTotalX();
  return (DisplayTab());
}

float Cal::Stati(int X, int Y)
{
  float Sup = 0;
  float Inf = 0;

  Sup = (this->_A - X) * (this->_B - Y);
  Inf = ((5 * this->_A) - 150) * ((5 * this->_B) - 150);
  return (Sup / Inf);
}