Caesar cipher: Difference between revisions

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@@ Line 176: / Line 176: @@
 =={{header|D}}==
-<lang d>import std.stdio, std.traits, std.ctype, std.conv;
+<lang d>import std.stdio, std.ascii;
-S rot(S)(S s, int key) if (isSomeString!S) {
+string rot(immutable string txt, in int key) pure nothrow {
-    dchar[] r = new dchar[s.length];
+    char[] r;
-    foreach (i, dchar c; s) {
+    foreach (c; txt)
-        if (islower(c))
+        if (isLower(c))
-            c = ((c - 'a' + key) % 26 + 'a');
+            r ~= (c - 'a' + key) % 26 + 'a';
-        else if (isupper(c))
+        else if (isUpper(c))
-            c = ((c - 'A' + key) % 26 + 'A');
+            r ~= (c - 'A' + key) % 26 + 'A';
-        r[i] = c;
+        else
-    }
+            r ~= c;
-    return to!S(r);
+    return r;
 }
@@ Line 203: / Line 204: @@
 Decrypted: The five boxing wizards jump quickly</pre>
 Simpler in-place version (same output):
-<lang d>import std.stdio, std.ctype;
+<lang d>import std.stdio, std.ascii;
-void inplaceRot(char[] txt, in int key) {
+void inplaceRot(char[] txt, in int key) pure nothrow {
     foreach (ref c; txt) {
-        if (islower(c))
+        if (isLower(c))
-            c = cast(char)((c - 'a' + key) % 26 + 'a');
+            c = (c - 'a' + key) % 26 + 'a';
-        else if (isupper(c))
+        else if (isUpper(c))
-            c = cast(char)((c - 'A' + key) % 26 + 'A');
+            c = (c - 'A' + key) % 26 + 'A';
     }
 }