langs a-z

Task/Anonymous-recursion/Objective-C/anonymous-recursion-2.m

@@ -0,0 +1,25 @@
+#import <Foundation/Foundation.h>
+
+int fib(int n) {
+    if (n < 0)
+        @throw [NSException exceptionWithName:NSInvalidArgumentException
+                                 reason:@"fib: no negative numbers"
+                               userInfo:nil];
+    __block int (^f)(int);
+    f = ^(int n) {
+        if (n < 2)
+            return 1;
+        else
+            return f(n-1) + f(n-2);
+    };
+    return f(n);
+}
+
+int main (int argc, const char *argv[]) {
+  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+
+  NSLog(@"%d", fib(8));
+
+  [pool release];
+  return 0;
+}