Boss health bar depletion

Hi, I have created a boss health bar for my game, I can make the numbers reduce when it takes damage, but I do not know how
to make the bar it's self string. A visual example of what I mean is here:

boss full hp

Code:

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BOSS 100%[**********]  // can take 10 hits

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now player hits boss 5 times

Code:

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BOSS 50%[*****    ]  // depelete visual bar and number

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All I am trying to do is make the visual bar deplete., like in metroid prime!! (cool game!) If any one knows of a way to do this or any tutorials I cant find would be greatful! thankx

make a 100% string and use substr() to cout less *.

Code:

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float GetHealthCoef(float Max,float Cur)
{
  return Cur/Max;
}

void DrawHealthBar(int x,int y,int maxlength,float health,float maxhealth)
{
  float coef=GetHealthCoef(health,maxhealth);

  int x2=x+maxlength;
  int barlength=x+coef*(x2-x);

  for (int i=x;i<barlength;i++)
  {
    //Draw health graphic at i,y
  }
}

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