overflow detector.v

// Assume that you have two 8-bit 2's complement numbers, a[7:0] and b[7:0]. These numbers are added to produce s[7:0]. Also compute whether a (signed) 
// overflow has occurred.

module top_module (
    input [7:0] a,
    input [7:0] b,
    output [7:0] s,
    output overflow
); 
    assign s=a+b;
    assign overflow=((a[7]==1&&b[7]==1&&s[7]==0)||(a[7]==0&&b[7]==0&&s[7]==1))?1:0;

endmodule