counter_4b.v

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module counter_4b(count,clk,reset);
output [3:0] count;
input clk,reset;

reg [3:0] count;

function [3:0] increment;
input [3:0] val;
reg [1:0] i;
reg carry;
    begin
	increment=val;
	carry =1'b1;
	
	for(i=2'b0;((carry==2'b1)&&(i<=3));i=i+2'b1)
	    begin
	     increment[i]=val[i]^carry;
	     carry=val[i]&carry;
	    end
    end
endfunction

always @ (posedge clk )
	if(reset)
	   count=4'b0;
	else
           count<=increment(count);



endmodule