hex

module segment_zero (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((~c2 & ~c0) | (~c3 & c1) | (c2 & c1) | (c3 & ~c0) | (~c3 & c2 & c0) | (c3 & ~c2 & ~c1));

endmodule

module segment_one (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((~c3 & ~c2) | (~c2 & ~c0) | (~c3 & ~c1 & ~c0) | (~c3 & c1 & c0) | (c3 & ~c1 & c0));

endmodule

module segment_two (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((~c3 & c2) | (c3 & ~c2) | (~c1 & c0) | (~c3 & ~c1) | (~c3 & c0));

endmodule

module segment_three (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((~c3 & ~c2 & ~c0) | (c1 & c0 & ~c2) | (~c1 & c0 & c2) | (c1 & ~c0 & c2) | (~c1 & ~c0 & c3));

endmodule

module segment_four (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((c1 & ~c0) | (c3 & c2) | (~c2 & ~c0) | (c3 & c1));

endmodule

module segment_five (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((~c1 & ~c0) | (c3 & ~c2) | (c3 & c1) | (c2 & ~c0) | (~c3 & c2 & ~c1));

endmodule

module segment_six (c3,c2,c1,c0,m);

    input c3;
    input c2;
    input c1;
    input c0;
    output m;

    assign m = ((c3 & ~ c2) | (c1 & ~c0) | (c1 & ~c2) | (c3 & c0) | (~c3 & c2 & ~c1));

endmodule

module seven_segment_display (SW, HEX0);

    input [3:0] SW;
    output [6:0] HEX0;

    segment_zero zero(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[0])
    );

    segment_one one(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[1])
    );

    segment_two two(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[2])
    );

    segment_three three(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[3])
    );

    segment_four four(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[4])
    );

    segment_five five(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[5])
    );

    segment_six six(
        .c3(SW[3]),
        .c2(SW[2]),
        .c1(SW[1]),
        .c0(SW[0]),
        .m(HEX0[6])
    );

endmodule