Arithmetic operator discrepancies

For similar languages or simple polyglots, sometimes it's useful to look for differences in how the languages perform arithmetic. This is because most (non-esoteric) languages have infix arithmetic operators and arithmetic can be a quick and easy way to introduce a difference.

For example:

• ^ is bitwise XOR in some languages and exponentiation in others
• / is integer division in some languages and floating point division in others
  • For the integer division languages, -1/2 is -1 in some languages (round down) and 0 in others (round to zero)
• -1%2 is -1 in some languages and 1 in others
• --x is a no-op in some languages (double negation) and pre-decrement in others
• 1/0 gives infinity in some languages and errors out in others
• 1<<64 gives 0 in some languages (overflow) and 36893488147419103232 in others