parpok · September 6, 2024 21:42 · Sep 6, 2024
diff --git a/CardValidateAlgorithm.cpp b/CardValidateAlgorithm.cpp
@@ -0,0 +1,48 @@
+
+#include <iostream>
+
+int main()
+{
+    std::string CardNumba;
+
+    int CardNumbers[16];
+    int SecondCardNumbers[8];
+
+    int fullCardEq{};
+
+    std::cout << "Gib card numba\n";
+    std::cin >> CardNumba;
+
+    if (CardNumba.length() != 16) {
+        std::cout << "Card number must be 16 digits long!\n";
+        return 1;
+    }
+
+
+    for (int i = 0; i < CardNumba.length(); i++) {
+        CardNumbers[i] = CardNumba[i] - '0';
+    }
+
+    for (int i = 0; i < 16; i++) {
+        int currentDigit = CardNumbers[i];
+
+        if (i % 2 == 0) {
+            currentDigit *= 2;
+            if (currentDigit > 9) {
+                currentDigit -= 9;
+            }
+
+        }
+
+        fullCardEq += currentDigit;
+    }
+
+    if (fullCardEq % 10 == 0) {
+        std::cout << "Valid card \n";
+    }
+    else {
+        std::cout << "Bad card \n";
+    }
+
+    return 0;
+}