diff --git a/math/sqrt_double.cpp b/math/sqrt_double.cpp
index b8027258d..6401ab2a3 100644
--- a/math/sqrt_double.cpp
+++ b/math/sqrt_double.cpp
@@ -5,39 +5,34 @@
 number in O(logn) time, 
 with precision fixed */
 
-double Sqrt(double x)
-{
+double Sqrt(double x) {
     double l = 0, r = x;
     /* Epsilon is the precision. 
     A great precision is 
     between 1e-7 and 1e-12.
     double epsilon = 1e-12;
     */
-    while( l <= r )
-    {
+    while ( l <= r) {
         double mid = (l + r) / 2;
-        if( mid * mid > x )
-        {
+        if ( mid * mid > x ) {
             r = mid;
         } 
-        else 
-        {
-            if( x - mid * mid < epsilon )
-            {
+        else {
+            if ( x - mid * mid < epsilon ) {
                 return mid;
             }
             l = mid;
         }
     }
     return -1;
+    
 }
 
-int main()
-{
+int main() {
   double n{};
   std::cin >> n;
   assert(n >= 0);
-  //Change this line for a better precision
+  // Change this line for a better precision
   std::cout.precision(12);
   std::cout << std::fixed << Sqrt(n);
 }