fpga设计一个计算器显示在lcd上面Verilog程序

以下是一个使用FPGA设计计算器并在LCD上显示结果的Verilog程序：

module calculator(
    input clk, //时钟信号
    input reset, //重置信号
    input [3:0] switch, //开关信号（用于输入数字和操作符）
    output reg [15:0] lcd_data //LCD数据输出信号
);

reg [3:0] operand1; //操作数1
reg [3:0] operand2; //操作数2
reg [3:0] operator; //操作符
reg [3:0] result; //结果

always @(posedge clk) begin
    if (reset) begin
        operand1 <= 0;
        operand2 <= 0;
        operator <= 0;
        result <= 0;
        lcd_data <= 0;
    end else begin
        if (switch[0]) begin //输入数字或操作符
            case (switch[3:1])
                3'b000: operand1 <= operand1 * 10 + 0;
                3'b001: operand1 <= operand1 * 10 + 1;
                3'b010: operand1 <= operand1 * 10 + 2;
                3'b011: operand1 <= operand1 * 10 + 3;
                3'b100: operator <= 1; //加法
                3'b101: operator <= 2; //减法
                3'b110: operator <= 3; //乘法
                3'b111: operator <= 4; //除法
            endcase
        end else if (switch[1]) begin //按下等于号
            case (operator)
                4'b0001: result <= operand1 + operand2;
                4'b0010: result <= operand1 - operand2;
                4'b0100: result <= operand1 * operand2;
                4'b1000: result <= operand1 / operand2;
            endcase
        end else if (switch[2]) begin //按下清零键
            operand1 <= 0;
            operand2 <= 0;
            operator <= 0;
            result <= 0;
        end else begin //输入第二个操作数
            operand2 <= operand2 * 10 + switch[3:0];
        end

        //将结果显示在LCD上
        lcd_data <= result;
    end
end

endmodule

需要注意的是，此代码仅为演示目的，并且应根据所使用的FPGA和LCD进行适当修改。