Vigenère cipher: Difference between revisions

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 =={{header|D}}==
 {{trans|C++}}
+ASCII only:
-<lang d>import std.stdio, std.string;
+<lang d>import std.stdio, std.string, std.ctype;
 string encrypt(string text, in string key) {
     string res;
     int j;
     foreach (c; text.toupper) {
-        if (c < 'A' || c > 'Z') continue;
+        if (!isupper(c))
-        res ~= (c + key[j] - 2 * 'A') % 26 + 'A';
+            continue;
-        j = ++j % key.length;
+        res ~= (c + key[j] - 2 * 'A') % 26 + 'A';
+        j++;
+        j %= key.length;
     }
     return res;
 }
 string decrypt(string text, in string key) {
     string res;
     int j;
     foreach (c; text.toupper) {
-        if (c < 'A' || c > 'Z') continue;
+        if (!isupper(c))
-        res ~= (c - key[j] + 26) % 26 + 'A';
+            continue;
-        j = ++j % key.length;
+        res ~= (c - key[j] + 26) % 26 + 'A';
+        j++;
+        j %= key.length;
     }
     return res;
 }
 void main() {
     auto key = "VIGENERECIPHER";
-    auto ori = "Beware the Jabberwock, my son! The jaws that bite, the claws that catch!";
+    auto ori = "Beware the Jabberwock, my son!" ~
+               " The jaws that bite, the claws that catch!";
     auto enc = encrypt(ori, key);
     writeln(enc);