Is “(float)integer == integer” guaranteed to be equal in C#?

Question

While \"we all know\" that x == y can be problematic, where x and y are floating point values, this question is a bit more specific:

Answer 1

I ran this code without an exception being thrown:

for (int x = Int16.MinValue; x < Int16.MaxValue; x++)
{
 float r = x;
 if (r != x)
 {
  throw new Exception("Failed at: " + x);
 }
}

Still waiting on (didn't complete this test because it took too long, never threw an exception though while running):

for (long x = Int64.MinValue; x < Int64.MaxValue; x++)
{
 float r = x;
 if (r != x)
 {
  throw new Exception("Failed at: " + x);
 }
}

Went back and ran your example with a caveat, this was the output:

[Exception: not equal 16777217 ?= 1.677722E+07 ?= 16777216]

for (int i = 0; i < int.MaxValue; i++)
{
 float f = i;
 if ((int)f != i) throw new Exception("not equal " + i + " ?= " + f + " ?= " + (int)f);
}