SS 2025

2023_CS50X/credit.c

@@ -0,0 +1,56 @@
+//// TODO ////
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int modulo = 0;
+    int start = 0;
+    long number = 0;
+
+    // Promt for input
+    number = get_long("Number: ");
+
+    printf("%li\n", number);
+
+    // Calculate checksum
+    //for (int i = length; i < length; i-=2)
+    //{
+    //    printf("number[i]");
+    //}
+
+
+    // Check for card length and starting digits
+
+
+    // If invalid Print INVALID\n
+
+    if (modulo != 0)
+    {
+        printf("INVALID\n");
+    }
+
+    // Else
+    else
+    {
+        // Print AMEX\n
+
+        if (start == 34 || start == 37)
+        {
+            printf("AMEX\n");
+        }
+
+        // Print MASTERCARD\n
+        else if (start == 51 || start == 52 || start == 53 || start == 54 || start == 55)
+        {
+            printf("MASTERCARD\n");
+        }
+
+        // Print VISA\n
+        else if (start == 4)
+        {
+            printf("VISA\n");
+        }
+    }
+}