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1-1 module test(a,b,sum,carry); input a,b; output sum, carry; xor(sum,a,b); and(carry,a,b); endmodule 1-2 module test(a,b,sum, carry); input a,b; output sum, carry; assign sum = (a^b); assign carry = (a&b); endmodule 1-3 module test(a,b,sum, carry); input a,b; output sum, carry; reg sum, carry; always @(a,b) begin sum = (a^b); carry = (a&b); end endmodule 2-1 module test(a,b,c,sum, carry); input a,b,c; output sum, carry; wire [2:0] temp; xor(temp[0],a,b); xor(sum,temp[0],c); and(temp[1],temp[0],c); and(temp[2],a,b); or(carry,temp[1],temp[2]); endmodule 2-2 module test(a,b,c,sum, carry); input a,b,c; output sum, carry; assign sum = ((a^b)^c); assign carry = ((a^b)&c)|(a&b); endmodule 2-3 module test(a,b,c,sum, carry); input a,b,c; output sum, carry; reg sum, carry; always @(a,b,c) begin sum = ((a^b)^c); carry = ((a^b)&c)|(a&b); end endmodule
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