verilog case statement

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hi ,

i am facing a problem in verilog case statement .when i put inputs (00,01,10,11) at inputs 00 and 10 to cntrl1 and cntrl2, it outputs the value from in0.

i use Xilinx software and my code is as follows :

module multiplexer(out,in0,in1,in2,in3,cntrl1,cntrl2);

input in0,in1,in2,in3,cntrl1,cntrl2;

output out;

reg out;

always @(in0 or in1 or in2 or in3 or cntrl1 or cntrl2)

case ({cntrl2,cntrl2})

2'b00 : out = in0;

2'b01 : out = in1;

2'b10 : out = in2;

2'b11 : out = in3;

default : $display("Please check control bits");

endcase

endmodule

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did you mean case ({cntrl1,cntrl2}) instead of case ({cntrl2,cntrl2})