Fractional values of numbers with `double`

The int data type only represents numbers without a fractional part. What if we want to store an approximation for π in a mathematics program? We can use a different data type, called a double, to store numbers that have values after the decimal point. double is short for double-precision floating point. Floating point means that there is a decimal point that can be placed at different locations (or float), in the number.

Computer programming languages evolve over time; double-precision just means that ...