library ieee;
use ieee.std_logic_1164.all;
entity mux57 is
       port( a,b,c,d,e,f,g: in std_logic_vector( 4 downto 0); --Inputs in the form of vectors for ease of coding and display on the wave plotter
             q: out std_logic_vector( 4 downto 0); -- Outputs in the same form for the same reasons
             sel : in std_logic_vector(2 downto 0)
            );
end entity mux57;
architecture behav of mux57 is
begin
        muxing : process is
        begin
                 wait for 1 ns;  --needed to avoid compiler warnings about infinte loops.
                 case sel is 
                    when "000" =>  --based on the sel input, make the output 'q' equal to one of the inputs
                        q <= a;
                    when "001" =>
                        q <= b; 
                    when "010" =>
                        q <= c; 
                    when "011" =>
                        q <= d; 
                    when "100" =>
                        q <= e; 
                    when "101" =>
                        q <= f; 
                    when "110" =>
                        q <= g; 
                    when others =>
                        q <= "00000";
                 end case;
      end process muxing;
end behav;
library ieee;
use ieee.std_logic_1164.all;
entity test_bench is 
end entity test_bench;
architecture behavior of test_bench is
    component mux57
       port( a,b,c,d,e,f,g: in std_logic_vector( 4 downto 0);
             q: out std_logic_vector( 4 downto 0);
             sel : in std_logic_vector(2 downto 0)
            );
  end component;
  signal a,b,c,d,e,f,g:  std_logic_vector( 4 downto 0);
  signal q :  std_logic_vector( 4 downto 0);
  signal sel : std_logic_vector(2 downto 0);
  begin
      dut: mux57 port map (
          a => a, -- linking test bench outputs to mux input and outputs
          b => b,
          c => c,
          d => d,
          e => e,
          f => f,
          g => g,
          q => q,
          sel => sel
        );
        inputs: process
        begin
            a <= "10001"; --setting each input to a unique value
            b <= "01010";
            c <= "10011";
            d <= "01100";
            e <= "10101";
            f <= "01110";
            g <= "10111";
            wait for 100 ns;
            
          end process;
         switch_input : process
         begin
            sel <= "000"; --switching between inputs to show functionality
            wait for 10 ns;
            sel <= "001";
            wait for 10 ns;
            sel <= "010";
            wait for 10 ns;
            sel <= "011";
            wait for 10 ns;
            sel <= "100";
            wait for 10 ns;
            sel <= "101";
            wait for 10 ns;
            sel <= "110";
            wait for 10 ns; 
          end process;
        end;