Question

How to check if all bits of a number are set in TypeScript

Answer 1

function get_bits(n : number) : string {
    return (n >>> 0).toString(2);
}
   
function is_all_bits_set(n : number) : number {
   return (n + 1) & n;
}
   
let n = 255;
   
console.log(get_bits(n));
console.log(get_bits(n + 1));
console.log(get_bits((n + 1) & n));
if (is_all_bits_set(n) === 0) {
    console.log("Yes");
} else {
    console.log("No");
}
   
console.log();  
   
n = 19;
   
console.log(get_bits(n));
console.log(get_bits(n + 1));
console.log(get_bits((n + 1) & n));
 
if (is_all_bits_set(n) === 0) {
    console.log("Yes");
} else {
    console.log("No");
}
  
  
  
/*
run:
     
"11111111" 
"100000000" 
"0" 
"Yes" 

"10011" 
"10100" 
"10000" 
"No" 
      
*/

 

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