add two numbers and find the maximum and minimum and the average

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float max(float a, float b)
{
  if (a > b)
    return a;
  return b;
}

float min(float a, float b)
{
  if (a < b)
    return a;
  return b;
}

float avg(float a, float b)
{
  return (a + b) / 2.0;
}