Delphi Programming/Arithmetic expression

An arithmetic expression returns a numerical value that can be used directly or stored in a numerical variable.

Addition operator "+"

The operator allowing the addition is the + operator. It allows to add a number or the result of an arithmetic expression to a number or an expression.

var
  x, y, z: integer;

begin
  x := 5; // Value of x is 5
  y := 3; // Value of y is 3
  z := x + y; // Z now has the value 8 (value of x plus y)
end.

Subtraction operator "-"

The operator allowing the subtraction is the - operator. It allows to subtract a number or the result of an arithmetic expression to a number or an expression.

var
  x, y, z: integer;

begin
  x := 5; // x = 5
  y := 3; // y = 3
  z = x - y; // Z = 2 (value of x minus y)
end.

Multiplication operator "*"

The operator allowing the multiplication is the * operator. It allows to multiply a number or the result of an arithmetic expression with a number or an expression.

var
  x, y, z: integer;

begin
  x := 5; // x = 5
  y := 3; // y = 3
  z := x * y; // Z = 15 (value of x times y)
end.

Division operator "/"

The operator allowing the division is the / operator. It allows to divide a number or the result of an arithmetic expression by a number or an expression. The result is a float.

var
  x, y: integer;
  z: real;

begin
  x := 5; // x = 5
  y := 3; // y = 3
  z := x / y; // Z = 1.666 (value of x divided by y)
end;

Euclidean division operator "div"

The operator allowing the euclidean division is the div operator. It allows to divide a number or the result of an arithmetic expression by a number or an expression. The result is a rounded integer.

var
  x, y, z: integer;

begin
  x := 5; // x = 5
  y := 3; // y = 3
  z := x div y; // Z = 1 (value of x divided by y)
end;

Modulo operator "mod"

The operator allowing the modulo is the mod operator. It allows to get the remainder of a number or the result of an arithmetic expression divided by a number or an expression.

var
  x, y, z: integer;

begin
  x := 5; // x = 5
  y := 3; // y = 3
  z := x mod y; // Z = 2 (remainder of x divided by y)
end;

Multiple expression

You can nest expressions but don't forget the brackets.

var
  w, x, y, z: integer;

begin
  w := 10; // w = 10
  x := 5; // x = 5
  y := 3; // y = 3
  z := (w - x) * y; // Y = 15 (w subtracted by x and then multiplied by y)
end;