Arithmetic operators occur in arithmetic operations, i. e. in expressions that contain integers or reals. There are two kinds of operators: Binary and unary arithmetic operators. Binary operators are listed in table (12.2), unary operators are listed in table (12.3).

Operator | Operation |

+ | Addition |

- | Subtraction |

* | Multiplication |

** | Exponentiation |

/ | Division |

Div | Integer division |

Mod | Remainder |

With the exception of Div and Mod, which accept only integer expressions as operands, all operators accept real and integer expressions as operands.

Remark The exponentiation operator (**) is available for overloading (chapter 15, page 868), but is not defined on any of the standard Pascal types (floats and/or integers).

For binary operators, the result type will be integer if both operands are integer type expressions. If one of the operands is a real type expression, then the result is real.

As an exception, division (/) results always in real values.

For unary operators, the result type is always equal to the expression type. The division (/) and Mod operator will cause run-time errors if the second argument is zero.

The sign of the result of a Mod operator is the same as the sign of the left side operand of the Mod operator. In fact, the Mod operator is equivalent to the following operation:

I mod J = I - (I div J) * J

But it executes faster than the right hand side expression.