Arithmetic operators

keysymbols: *, /, +, -, %

The binary operators are multiply, divide, add, subtract and modulus used as shown in the examples below.

        module arithTest;
           reg [3:0] a, b;

           initial begin
              a = 4'b1100; // 12
              b = 4'b0011; // 3

              $displayb(a * b); // multiplication, evaluates to 4'b1000
                                // the four least significant bits of 36
              $display(a / b);  // division, evaluates to 4
              $display(a + b);  // addition, evaluates to 15
              $display(a - b);  // subtraction, evaluates to 9
              $display((a + 1'b1) % b); // modulus, evaluates to 1

           end

        endmodule // arithTest

Note If any bit of an operand is unknown: x, then the result of any arithmetic operation is also unknown.