lucky number is implemented

src/luckyNumber.cpp

@@ -0,0 +1,35 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+bool luckyNumber(int n){
+
+    bool count[10];
+    for(int i = 0;i<10;i++)
+        count[i] = 0;
+
+    while(n > 0){
+        int dig = n%10;
+        if(count[dig])
+            return false;
+        n /= 10;
+    }
+    return true;
+
+}
+
+int main(){
+
+    int n;
+    cout<<"Enter a number :";
+    cin>>n;
+
+    bool ans = luckyNumber(n);
+    if(ans){
+        cout<<"It is a lucky number";
+    }
+    else{
+        cout<<"It is not a lucky number";
+    }
+
+    return 0;
+}