Rules for constructing Real Constants in exponential form

Normally in arithmetic also we have seen that the exponential form is represented in two parts, one is called mantissa part and the other is called the exponent part. The part which is written before the ‘e’ is called the mantissa and the part which is written after it is called the exponent part. {also see: Rules for constructing Real Constants}




The rules which must be followed to construct the real constants expressed in exponential form are as follows:
1. The mantissa part and the exponential part should be separated by a letter e.
2. The mantissa part may have a positive or negative sign.
3. Default sign of mantissa part is positive.
4. The exponent must have at least one digit, which must be a positive or negative integer. Default sign is positive.
5. Range of real constants expressed in exponential form is –3.4e38 to 3.4e38.
Ex:
+35.8e-4
8.2e6
-0.4e+7
-7.1e-1