Delphi Programming/Arithmetic expression

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

Addition operator "+"[edit]

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.

1 var
2   x, y, z: integer;
3 
4 begin
5   x := 5; // Value of x is 5
6   y := 3; // Value of y is 3
7   z := x + y; // Z now has the value 8 (value of x plus y)
8 end.

Subtraction operator "-"[edit]

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.

1 var
2   x, y, z: integer;
3 
4 begin
5   x := 5; // x = 5
6   y := 3; // y = 3
7   z = x - y; // Z = 2 (value of x minus y)
8 end.

Multiplication operator "*"[edit]

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.

1 var
2   x, y, z: integer;
3 
4 begin
5   x := 5; // x = 5
6   y := 3; // y = 3
7   z := x * y; // Z = 15 (value of x times y)
8 end.

Division operator "/"[edit]

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.

1 var
2   x, y: integer;
3   z: real;
4 
5 begin
6   x := 5; // x = 5
7   y := 3; // y = 3
8   z := x / y; // Z = 1.666 (value of x divided by y)
9 end;

Euclidean division operator "div"[edit]

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.

1 var
2   x, y, z: integer;
3 
4 begin
5   x := 5; // x = 5
6   y := 3; // y = 3
7   z := x div y; // Z = 1 (value of x divided by y)
8 end;

Modulo operator "mod"[edit]

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.

1 var
2   x, y, z: integer;
3 
4 begin
5   x := 5; // x = 5
6   y := 3; // y = 3
7   z := x mod y; // Z = 2 (remainder of x divided by y)
8 end;

Multiple expression[edit]

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

1 var
2   w, x, y, z: integer;
3 
4 begin
5   w := 10; // w = 10
6   x := 5; // x = 5
7   y := 3; // y = 3
8   z := (w - x) * z; // Z = 15 (w subtracted by x and then multiplied by z)
9 end;