ex-basics-if.v

module top;

  logic [7:0] a;
  logic [7:0] b;
  logic       sel;

  initial begin

    // if statement

    a = 8'd30;
    b = 8'd16;

    if ( a == b ) begin
      $display( "30 == 16" );
    end

    if ( a != b ) begin
      $display( "30 != 16" );
    end

    // if else statement

    sel = 1'b1;

    if ( sel == 1'b0 ) begin
      a = 8'h0a;
    end
    else begin
      a = 8'h0b;
    end

    $display( "sel = 1, a = %x ", a );

    // if else statement w/ X

    sel = 1'bx;

    if ( sel == 1'b0 ) begin
      a = 8'h0a;
    end
    else begin
      a = 8'h0b;
    end

    $display( "sel = x, a = %x ", a );

  end

endmodule