tasks a-s

Task/Reverse-a-string/Objective-C/reverse-a-string-1.m

@@ -0,0 +1,20 @@
+#import <Foundation/Foundation.h>
+
+@interface NSString (Extended)
+-(NSString *)reverseString;
+@end
+
+@implementation NSString (Extended)
+-(NSString *) reverseString
+{
+    NSUInteger len = [self length];
+    NSMutableString *rtr=[NSMutableString stringWithCapacity:len];
+    //        unichar buf[1];
+
+    while (len > (NSUInteger)0) {
+        unichar uch = [self characterAtIndex:--len];
+        [rtr appendString:[NSString stringWithCharacters:&uch length:1]];
+    }
+    return rtr;
+}
+@end