2진법 16진법 변환 구현

2진법 16진법 변환 구현

 

Javascript

let bin = "11111010";
let hex = "FA";

function binTohex(num) {
  num = num.split("");
  let [bin_first, bin_second] = [num.slice(0, 4), num.slice(4)];

  let ret1 = 0;
  let ret2 = 0;
  for (let i = 0; i < 4; i++) {
    if (i === 0) {
      ret1 += +bin_first[i] * 8;
      ret2 += +bin_second[i] * 8;
    } else if (i === 1) {
      ret1 += +bin_first[i] * 4;
      ret2 += +bin_second[i] * 4;
    } else if (i === 2) {
      ret1 += +bin_first[i] * 2;
      ret2 += +bin_second[i] * 2;
    } else {
      ret1 += +bin_first[i];
      ret2 += +bin_second[i];
    }
  }

  let hexs = {
    0: "0",
    1: "1",
    2: "2",
    3: "3",
    4: "4",
    5: "5",
    6: "6",
    7: "7",
    8: "8",
    9: "9",
    10: "A",
    11: "B",
    12: "C",
    13: "D",
    14: "E",
    15: "F",
  };

  let hex = hexs[ret1] + hexs[ret2];
  let ten = ret1 * 16 + ret2;
  console.log(hex, ten);
}

binTohex(bin);