Binary arithmetic

Type conversions may occur during arithmetic operations: arguments are converted to the highest type in common: float or int.

The Addition (+) operator yields the sum of the operands. If the operands are compatible sequences, it yields a new sequence with the operands concatenated.

The Addition (-) operator yields the difference of the operands.

The Multiplication (*) operator yields the product of the operands.

The Division (/) operator yields the quotient of the operands.

The Remainder (%) operator yields the remainder of the division of the first operand by the second operand.

The Concatenation (&) operator is not really an arithmetic operation; rather, it always results in a string by concatenating a string presentation of operands together.

  add-expr := expr "+" expr 
  add-expr := expr "-" expr 
  add-expr := expr "&" expr 

  mul-expr := expr "*" expr 
  mul-expr := expr "/" expr 
  mul-expr := expr "%" expr 

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