A floating-point constant is a base-10 number that
contains either a decimal point or an exponent or both. A floating-point
constant can be written in two forms: Factorial form or Exponential form. A
floating-point constant in a fractional form must have at least one digit each
to the left and right of the decimal point. A floating-point in exponent form
consists of a mantissa and an exponent. The mantissa itself is represented as a
decimal integer constant or a decimal floating-point constant in fractional
form. The letter E or e and the exponent follow the mantissa. The exponent must
be a decimal integer. The actual number of digits in the mantissa and the
exponent depends on the computer being used.
The following are valid floating-point constants.</1.0
0.1 2E-4 -0.1555e-4
The following floating-point constants are written incorrectly for the
reasons stated.written incorrectly for the reasons stated.
No decimal point or exponent.
2,00.8 Illegal character (,).
2 E+10.20 Exponent must be an
3 E10 Illegal character (space).