Scientific Notation Converter

1. All non-zero digits are significant: 1234 has 4 sig figs

2. Zeros between non-zero digits are significant: 1002 has 4 sig figs

3. Leading zeros are NOT significant: 0.0056 has 2 sig figs

4. Trailing zeros after decimal point ARE significant: 2.300 has 4 sig figs

5. Trailing zeros in whole number are ambiguous: 1200 has 2, 3, or 4 sig figs