diff --git a/c++/Square root of a number.cpp b/c++/Square root of a number.cpp
new file mode 100644
index 0000000..005f2cc
--- /dev/null
+++ b/c++/Square root of a number.cpp	
@@ -0,0 +1,35 @@
+#include<iostream>
+using namespace std;
+
+class Solution{
+    public:
+        long long int floorSqrt(long long int x)
+        {
+            long long s=0, e=x;
+            long long int ans=0;
+            while(s<=e)
+            {
+                long long int mid=s+(e-s)/2;
+                if(mid*mid==x)
+                    return mid;
+                else if(mid*mid<x)
+                {
+                    ans=mid;
+                    s=mid+1;
+                }
+                else
+                    e=mid-1;
+            }
+            return ans;
+        }
+};
+
+int main()
+{
+    long long num;
+    cout<<"Enter the number : ";
+    cin>>num;
+    Solution ans;
+    cout<<"The square root of "<< num <<" is : "<<ans.floorSqrt(num);
+    return 0;
+}