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How to check whether the number has only first and last bits set in JavaScript

1 Answer

0 votes
function get_bits(n){
    return (n >>> 0).toString(2);
}
 
function is_only_first_and_last_bit_set(n) { 
    return (((n - 1) & (n - 2)) === 0); 
} 
 
var n = 129;
  
document.write(get_bits(n) + "<br />");
document.write(get_bits(n - 1) + "<br />");
document.write(get_bits(n - 2) + "<br />");
document.write(get_bits((n - 1) & (n - 2)) + "<br />");

if (is_only_first_and_last_bit_set(n)) 
    document.write("Yes\n"); 
else
    document.write("No\n"); 
 
   
  
/*
run:
    
10000001
10000000
1111111
0
Yes 
     
*/

 




answered Mar 10 by avibootz
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