The code `seconds % 1800` calculates the remainder when the...

The code seconds % 1800 calculates the remainder when the variable seconds is divided by 1800. This is called the modulus operation.

What it does:

• The result will always be in the range [0, 1799].
• It essentially determines how many seconds are left over after removing whole 1800-second blocks from seconds.

Context (if seconds represents time):

• 1800 seconds equals 30 minutes.
• If seconds represents an amount of time, this operation could be used to figure out the remaining seconds after grouping the time into 30-minute intervals. For example:
  • If seconds = 3700, then 3700 % 1800 = 100 (3700 seconds is 2 full 30-minute segments and 100 extra seconds).