n位乘加器（先乘后加）
设计n位乘加器（先乘后加）Design a n-bit multiplier (firstly multiply and then add)
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module MAC_N
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#(
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parameter N = 16
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)
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(
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input [N - 1: 0 ] A,
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input [N - 1: 0 ] B,
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input [N - 1: 0 ] C,
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output [2*N - 1 : 0] R
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);
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assign R = A * B + C;
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endmodule
