2021-09-05
A integer is digit digit*.
A digit is 0|1|2|3|4|5|6|7|8|9.
A real is integer exponent.
A exponent is +|- integer.
Therefore, in 1E-4:
1 is a digit, a integer is one or more digits.
4 is a digit, a integer is one or more digits.
E-4 is a exponent, therefore, everything in the statement is a integer/real, so the overall expression is a number.
A integer is digit digit*.
A digit is 0|1|2|3|4|5|6|7|8|9.
A real is integer exponent.
A exponent is +|- integer.
Therefore, in 1E-4:
1 is a digit, a integer is one or more digits.
4 is a digit, a integer is one or more digits.
E-4 is a exponent, therefore, everything in the statement is a integer/real, so the overall expression is a number.
2021-09-06
Integer -> any concatenation of (0|1|2|3|4|5|6|7|8|9)
number -> real|integer
1E-4 is therefore a real number because it is a 1(which is an integer) with the exponent E-4
Integer -> any concatenation of (0|1|2|3|4|5|6|7|8|9)
number -> real|integer
1E-4 is therefore a real number because it is a 1(which is an integer) with the exponent E-4
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