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introduction.md

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A floating-point number is a number with zero or more digits behind the decimal separator. Examples are -2.4, 0.1, 3.14, 16.984025 and 1024.0.

Different floating-point types can store different numbers of digits after the digit separator - this is referred to as its precision.

C# has three floating-point types:

  • float: 4 bytes (~6-9 digits precision). Written as 2.45f.
  • double: 8 bytes (~15-17 digits precision). This is the most common type. Written as 2.45 or 2.45d.
  • decimal: 16 bytes (28-29 digits precision). Normally used when working with monetary data, as its precision leads to less rounding errors. Written as 2.45m.

As can be seen, each type can store a different number of digits. This means that trying to store PI in a float will only store the first 6 to 9 digits (with the last digit being rounded).

In this exercise you may also want to use a loop. There are several ways to write loops in C#, but the while loop is most appropriate here.