how Decimal data type evaluatesto such a long range while it's precision is 29 digits only

what is the a开发者_Go百科ctual mechanism by which Decimal does calculations upto such a big range(1.7E+308) while it's precision is only 29 digits and it also takes only 8 Bytes.

It doesn't - decimal only works up to 29 digits and the maximum value is 79,228,162,514,264,337,593,543,950,335.

double, however, has fewer significant digits but a much bigger range. It does this by becoming much less precise for larger numbers. The exponent part can be much larger in double than in decimal.

I have articles on binary and decimal floating point arithmetic in .NET which explain the storage format in more detail.

Oh, and decimal takes 16 bytes, not 8.