Verilog syntax error whenever I run the vvp command

Solution for Verilog syntax error whenever I run the vvp command
is Given Below:

I’m encountering an error with running my testbench as whenever I input try to run it with the vvp command, I only get a message that reads “SantiJ1.v:1:syntax error”. I’ve looked through my code and there doesn’t seem to be a problem, at least from what I can see.

Here’s the module:

`timescale 1ns/1ps

module HDLProject1(A, B, C, D, AB, BA, P1, P2, F);

    input A, B, C, D;
    output nA, nB, nD, AB, BA, P1, P2, F;

    not notA(nA, A);
    not notB(nB, B);
    and Part1(AB, A, nB);
    and Part2(BA, B, nA);
    or  Level1(P1, AB, BA);
    not notD(nD, D);
    or  Level2(P2, C, nD);
    and Finish(F, P1, P2);

endmodule

And here’s the testbench:

`timescale 1ns/1ps

module HDLProject_tb;

    reg test_A, test_B, test_C, test_D;
    wire test_AB, test_BA, test_P1, test_P2, test_F;

    HDLProject1 dut(test_A, test_B, test_C, test_D, test_AB, test_BA, test_P1, test_P2, test_F);
    initial
        begin
            test_A = 0;
            test_B = 0;
            test_C = 0;
            test_D = 0; 

            #10 
            test_A = 0;
            test_B = 0;
            test_C = 0;
            test_D = 1; 

            #10 
            test_A = 0;
            test_B = 0;
            test_C = 1;
            test_D = 0;

            #10 
            test_A = 0;
            test_B = 0;
            test_C = 1;
            test_D = 1; 

            #10 test_A = 0;
            test_B = 1;
            test_C = 0;
            test_D = 0; 

            #10 
            test_A = 0;
            test_B = 1;
            test_C = 0;
            test_D = 1; 

            #10 test_A = 0;
            test_B = 1;
            test_C = 1;
            test_D = 0;

            #10 
            test_A = 0;
            test_B = 1;
            test_C = 1;
            test_D = 1;  

            #10 test_A = 1;
            test_B = 0;
            test_C = 0;
            test_D = 0; 

            #10 
            test_A = 1;
            test_B = 0;
            test_C = 0;
            test_D = 1; 

            #10 
            test_A = 1;
            test_B = 0;
            test_C = 1;
            test_D = 0; 

            #10 
            test_A = 1;
            test_B = 0;
            test_C = 1;
            test_D = 1; 

            #10 
            test_A = 1;
            test_B = 1;
            test_C = 0;
            test_D = 0; 

            #10 
            test_A = 1;
            test_B = 1;
            test_C = 0;
            test_D = 1; 

            #10 
            test_A = 1;
            test_B = 1;
            test_C = 1;
            test_D = 0; 

            #10 
            test_A = 1;
            test_B = 1;
            test_C = 1;
            test_D = 1; 
         end
        
    initial
        begin
        $monitor("time = %0d", $time, " A = %b  B = %b  C = %b  D = %b Output_F = %b", test_A, test_B, test_C, test_D, test_F);
        $dumpfile("SantiJ1.vcd");
        $dumpvars();
        end
endmodule

From what I can gather from the error message, it only points to line 1, but I can’t really point a finger at a possible cause for the error as I’m new to using HDLs.

Are you observing the following error?

$ vvp SantiJ1.v HDLProject_tb.v 
SantiJ1.v:1: syntax error

The issue is that that vvp isn’t supposed to be used that way. What you need to do is:

$ iverilog HDLProject_tb.v SantiJ1.v
$ vvp ./a.out 
VCD info: dumpfile SantiJ1.vcd opened for output.
time = 0 A = 0  B = 0  C = 0  D = 0 Output_F = 0
time = 10 A = 0  B = 0  C = 0  D = 1 Output_F = 0
time = 20 A = 0  B = 0  C = 1  D = 0 Output_F = 0
time = 30 A = 0  B = 0  C = 1  D = 1 Output_F = 0
time = 40 A = 0  B = 1  C = 0  D = 0 Output_F = 1
time = 50 A = 0  B = 1  C = 0  D = 1 Output_F = 0
time = 60 A = 0  B = 1  C = 1  D = 0 Output_F = 1
time = 70 A = 0  B = 1  C = 1  D = 1 Output_F = 1
time = 80 A = 1  B = 0  C = 0  D = 0 Output_F = 1
time = 90 A = 1  B = 0  C = 0  D = 1 Output_F = 0
time = 100 A = 1  B = 0  C = 1  D = 0 Output_F = 1
time = 110 A = 1  B = 0  C = 1  D = 1 Output_F = 1
time = 120 A = 1  B = 1  C = 0  D = 0 Output_F = 0
time = 130 A = 1  B = 1  C = 0  D = 1 Output_F = 0
time = 140 A = 1  B = 1  C = 1  D = 0 Output_F = 0
time = 150 A = 1  B = 1  C = 1  D = 1 Output_F = 0

In point of fact, ./a.out‘s first line includes the necessary shell magic to be runnable by default. So, you can run it directly:

$ head -1 ./a.out 
#! /usr/bin/vvp
$ ./a.out