字符串重组，字符串的插入，替换，删除，拼接

/*
    <span style="white-space:pre">	</span>1>多个数据拼接成一个字符串
	2>字符串的末尾追加新的字符
	3>在指定的范围插入字符串
	4>使用新的字符替换原有的字符
	5>在字符串中删除特定的某些字符
	6>去掉字符串中的空格
 */
#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
      
      
        int year = 2015;
        int month = 07;
        int day = 20;
        NSString * address = @"北京市";
        NSString * dateAndAddress = [[NSString alloc] initWithFormat:@"%d年%d月%d日 地址:%@",year,month,day,address];
        NSLog(@"%@",dateAndAddress);
        
      
        NSString * str2 = @"qianfeng";
        // qianfeng.com
        NSString *str3 = [str2 stringByAppendingString:@".com"];
        NSLog(@"str3 %@  str2 %@",str3,str2);
        
        
        NSString * str4 = @"www..com";
        // www.baidu.com
        NSRange range = {3,2};
        NSString * str5 = [str4 stringByReplacingCharactersInRange:range withString:@"-baidu-"];
        NSLog(@"str5 %@",str5);
        
        
        NSString * str6 = @"www.baidu.com";
      
        NSString * str7 = [str6 stringByReplacingOccurrencesOfString:@"." withString:@"-"];
        NSLog(@"str7 %@",str7);
        
        //5>在字符串中删除特定的某些字符
        NSString * str8 = @"www..baidu..com";
      
        NSString * str9 = [str8 stringByReplacingOccurrencesOfString:@"." withString:@""];
        NSLog(@"str9 %@ str8 %@",str9,str8);
        
       
        NSString * str10 = @"www baidu com";
        NSString * str11 = [str10 stringByReplacingOccurrencesOfString:@" " withString:@""];
        NSLog(@"str11 %@",str11);
    }
    return 0;
}