73. SR Latch

Use switch case to solve

module sr_latch_nor (
    input  S,
    input  R,
    output reg Q,
    output reg Qn
);
    always @* begin
        case ({S, R})
            2'b10: begin Q = 1; Qn = 0; end   
            2'b01: begin Q = 0; Qn = 1; end   
            2'b00: ;                          
            2'b11: begin Q = 1'b0; Qn = 1'b1; end 
        endcase
    end
endmodule