I have an input filed and i am putting value in it dynamically so i am getting 01 value to put in the text box

$('#final_result').val(open+close); 

I have an input field wich id is final_result and i am getting 0 in open and 1 in close as a number. I try to convert it into string like

$('#final_result').val(toString(open)+toString(close)); 

but still getting 1 in input i want 01 in input field