1-9 作业 2

//
//  main.m
//  作业2
//
//  Created by syrcfwzx on 16/1/9.
//  Copyright (c) 2016年 syrcfwzx. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        NSString* str = @"abc123.xyz789";
        NSInteger len = [str length];
        NSMutableString* reverse = [NSMutableString string];
        for(NSInteger i=len-1;i>=0;i--)
        {
            unichar c = [str characterAtIndex:i];
            NSString* temp = [NSString stringWithCharacters:&c length:1];
            [reverse appendString:temp];
        }
        NSLog(@"%@",reverse);
    }
    return 0;
}