feature(b2d-conversion-viceversa) : Binary to decimal conversion and …

…viceversa

rohit/js/b2d-conversion-viceversa.js

@@ -0,0 +1,39 @@
+function B2D(binNumber) {
+  let bn = binNumber;
+  let res = 0;
+  let itr = 0;
+
+  while (bn > 0) {
+    let last_digit = bn % 10;
+    bn = parseInt(bn / 10);
+
+    if (last_digit !== 0 && last_digit !== 1) {
+      return "Invalid Binary Number";
+    }
+
+    res += last_digit * 2 ** itr;
+
+    itr++;
+  }
+
+  return res;
+}
+
+function D2B(decNumber) {
+  // 9
+  let dn = decNumber;
+  let res = 0;
+  let fact = 1;
+
+  while (dn > 0) {
+    rem = dn % 2;
+    res += rem * itr; //1
+    dn = parseInt(dn / 2); ///4
+    fact *= 10;
+  }
+
+  return res;
+}
+
+console.log(B2D(1001));
+console.log(D2B(26));