How to Difference in Verilog - Code Snippet

How to perform 'Difference' in Verilog.

example.v
// Task: Difference
// Language: Verilog

module difference() 
    // Implementation for Difference
    reg result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Difference
    $display("Done");
endmodule
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