WIP: correction

utilise BigInteger, erreur sur 1er IBAN

Iban.java

@@ -1,4 +1,5 @@
 import static utils.Utils.*;
+import java.math.BigInteger;
 
 public class Iban {
 
@@ -18,7 +19,56 @@ public class Iban {
   }
 
   public static boolean verifIban(char[] iban) {
-    return false;
+    char[] etape1 = deplacer(iban);
+    int[] etape2 = remplacerLettres(etape1);
+    BigInteger num = convertir(etape2);
+    BigInteger rem = num.remainder(BigInteger.valueOf(97));
+    return rem.equals(BigInteger.ONE);
+  }
+
+  public static char[] deplacer(char[] in) {
+    char[] out = new char[in.length];
+    for (int i=0;i<4;i++) {
+      out[out.length-4+i]=in[i];
+    }
+    for (int i=4; i<in.length;i++) {
+      out[i-4] = in[i];
+    }
+    return out;
+  }
+
+  public static int[] remplacerLettres(char[] in) {
+    int[] out = new int[in.length];
+    for (int i=0;i<in.length;i++) {
+      // '0' => 48, '1' => 49, ...
+      // 'A' => 65, 'B' => 66
+      char c = in[i];
+      int cAsInt = c;
+      int cc;
+      if (cAsInt > 64) {
+        cc = cAsInt - 55;
+      } else {
+        cc = cAsInt - 48;
+      }
+      out[i] = cc;
+    }
+    return out;
+  }
+
+
+  public static BigInteger convertir(int[] in) {
+    BigInteger sum = BigInteger.valueOf(0);
+    long mult = 1;
+    for (int i=0;i<in.length;i++) {
+      int val = in[i];
+      sum = sum.add(BigInteger.valueOf(in[i] * mult));
+      if (val < 10) {
+        mult *= 10;
+      } else {
+        mult *= 100;
+      }
+    }
+    return sum;
   }
 
 }

utils/Utils.java

@@ -44,6 +44,10 @@ public class Utils {
     }
   }
 
+  public static final void afficher(char[] args) {
+    System.out.println(new String(args));
+  }
+
   public static final void afficher(Object... args) {
     if (args == null) {
       System.out.println("null");
@@ -51,6 +55,7 @@ public class Utils {
       String str = Arrays.stream(args)
       .map(String::valueOf)
       .collect(Collectors.joining(" "));
+
       System.out.println(str);
     }
     System.out.print(' ');