Arithmetic Expressions
 +, as expected
 * is multiply
 / is strange
 For float types it is fine.
 For integers it is integer division.
 The other part of integer division is % (modulus)
 This is the remainder part.
 5 % 3 = 2
 4 % 7 = 4
 This is more useful than you would think.
 Some strange ones
 We do
i = i + 1
so often they gave us two short cuts
 We do things like
i = i * n
frequently so they gave us

triple *= 3;

luck += 7;

age /= 15;

months %= 9;
 Look at appendix B, operator precedence.
 Please Excuse My Dear Aunt Sally applies
 () work just fine.