Add ButterflyPattern.cpp in C++

C++ Code/ButterflyPattern.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+    long long n; //using "long long" for bigger inputs, not with "int"
+    cout << "Enter number of rows (n): ";
+    cin >> n;
+
+    // Input validation
+    if (n <= 0) {
+        cout << "Yrr, number of rows toh positive daal na!" << endl;
+        return 1;
+    }
+    if (n > 1000) { // Limit to avoid console crash
+        cout << "Itna bada n? Console hang ho jayega! 1000 tak try kar." << endl;
+        return 1;
+    }
+
+    for (long long i = 1; i <= 2 * n; i++) {
+        long long stars = (i <= n) ? i : (2 * n - i + 1);
+        long long spaces = 2 * (n - stars);
+
+        // Left stars
+        for (long long j = 0; j < stars; j++) {
+            cout << "*";
+        }
+
+        // Middle spaces
+        for (long long j = 0; j < spaces; j++) {
+            cout << " ";
+        }
+
+        // Right stars
+        for (long long j = 0; j < stars; j++) {
+            cout << "*";
+        }
+
+        cout << endl;
+    }
+
+    return 0;
+}