Separate an integer into two (nearly) equal parts

Question

I need to separate an integer into two numbers. Something like dividing by two but I only want integer components as a result, such as:

6 = 3 and 3
7 = 4 and         


        

Answer 1

var n = 7;
var p1 = (n - (n % 2)) / 2;
var p2 = (n + (n % 2)) / 2;

console.log(p1, p2);

Answer 2

Another way to do this is using bitwise operators. It doesn't work for very big numbers

function splitter(number){
  part1 = (number>>1) + (number&1);
  part2 = number>>1;
  console.log(number + ":", part1 + "+" + part2);
}

splitter(7);
splitter(6);
splitter(2**30+1); // Breaks for values greater than 2**31
splitter(2**31+1); 

Answer 3

Or this way :)

var number = 7;
var part1 = ~~((number / 2) + (number % 2));
var part2 = ~~(number / 2);

console.log(part1, part2);

Answer 4

Just find the first part and subtract it from the original number.

var x = 7;

var p1 = Math.floor(x / 2);
var p2 = x - p1;

console.log(p1, p2);

In the case of x being odd, p1 will receive the smaller of the two addends. You can switch this around by calling Math.ceil instead.

Answer 5

var num = 7;

var part1 = parseInt(num/2);
var part2 = num - part1;

console.log(part1, part2);

Answer 6

Your code can be simplified a bit:

var num = 7;
var p1 = Math.floor(num / 2);
var p2 = p1;

if (num % 2 != 0) {
   p1++;
}
console.log(p1, p2);