For example, 1 is an integer. It is also a rational (being equal to the quotient of two integers, namely 1/1, or 2/2, or …), it is on the real line, and it is also in the complex plane (we could write it as 1 + 0i).
Typographic choices, such as the inclusion of a decimal point, an exponent, or trailing zeros, do not alter the mathematics. Thus "1", "1.", "1.0", "1.0e0" and "1.000000000000000" are all ways to write the same mathematical number; namely, the integer "one".
Some wag once said, "A computer scientist is a person who refuses to believe that 1.0 is an integer." Don't you make that mistake.
