练习题12

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        /*
         第1题 字符串中的world替换为i bookan wisdom
         */
        NSLog(@"第一题");
        NSString *str1=@"hello world and sunshine";
        NSMutableString *newstr1=[NSMutableString stringWithString:str1];
        NSRange range=[newstr1 rangeOfString:@"world"];
        [newstr1 replaceCharactersInRange:range withString:@"i bookan wisdom"];
        NSLog(@"%@",newstr1);
    
        /*
         第2题 字符串的相加，以字符串输出，并输出长度
         */
        NSLog(@"第二题");
        NSString *str2=@"999";
        NSString *str3=@"888";
        NSInteger s1=[str2 intValue];
        NSInteger s2=[str3 intValue];
        long su=s1+s2;
        NSString *sum=[[NSString alloc]initWithFormat:@"%ld",su];
        NSLog(@"%@",sum);
        
        /*
         第3题 比较字符串大小
         */
        NSLog(@"第三题");
        NSString *str4=@"ABC";
        NSString *str5=@"ABc";
        NSComparisonResult result=[str4 compare:str5];
        if (result==NSOrderedAscending) {
            NSLog(@"str4>str5");
        }else if (result==NSOrderedDescending)
        {
            NSLog(@"str4<str5");
        }
        else{
            NSLog(@"str4=str5");
        }
        /*
         第4题 截取Android并输出
         */
        NSLog(@"第四题");
        NSString *str6=@"iphoneAndroid";
        NSMutableString *newstr6=[NSMutableString stringWithString:str6];
        NSRange range1;
        range1=[str6 rangeOfString:@"Android"];
        [newstr6 replaceCharactersInRange:range1 withString:@""];
        NSLog(@"%@",newstr6);
        /*
         第5题 用c语言创建一个oc字符串，并输出。使用两种方法。
         
         */
        NSLog(@"第五题");
        char *s="zhangsanfeng";
        printf("%s",s);
        printf("\n");
        NSLog(@"第一种方法");
        NSString *news1=[NSString stringWithCString:s];
        NSLog(@"%@",news1);
        NSLog(@"第二种方法");
        NSString *news2=[NSString stringWithFormat:@"%s",s];
        NSLog(@"%@",news2);
        /*
         第6题 字符串内所有a都替换成A;
         */
        NSLog(@"第六题");
        NSString *str7=@"whatareyou";
        NSMutableString *newstr7=[NSMutableString stringWithString:str7];
        NSString *new=[newstr7 stringByReplacingOccurrencesOfString:@"a" withString:@"A"];
        NSLog(@"%@",new);
        /*
         第7题 判断字符串是否以http开头
         */
        NSLog(@"第七题");
        NSString *str8=@"http://www.sina.com.cn";
        BOOL result1=[str8 hasPrefix:@"http"];
        if (result1!=NSOrderedSame) {
            NSLog(@"是");
        }
        
        /*
         第8题 将字符串内admin和123截取出来
         */
        NSLog(@"第八题");
        NSString *str9=@"http://localhost:8099/test/user=admin&pwd=123";
        NSRange range2;
        NSRange range3;
        NSRange newrange1;
        range2=[str9 rangeOfString:@"user="];
        range3=[str9 rangeOfString:@"&pwd="];
        newrange1.length=range3.location-(range2.location+range2.length);
        newrange1.location=(range2.location+range2.length);
        NSString *new1=[str9 substringWithRange:newrange1];
        NSString *new2=[str9 substringFromIndex:range3.location+range3.length];
        NSLog(@"%@",new1);
        NSLog(@"%@",new2);
        
        
        /*
         第9题 字符添加telephone:iphone iphone5修改为"telephone:iphone iphone4 iphone5 iphone6";
         */
        NSLog(@"第九题");
        NSString *str10=@"telephone:iphone iphone5";
        NSMutableString *newstr10=[NSMutableString stringWithString:str10];
        NSRange range4=[newstr10 rangeOfString:@"iphone5"];
        [newstr10 deleteCharactersInRange:range4];
        [newstr10 appendString:@"iphone4 iphone5 iphone6"];
        NSLog(@"%@",newstr10);
        
        
        /*
         第10题 排序
         */
        NSArray *arr=@[@"String 11",@"String 21",@"String 1",@"string 2",@"String 02"];
        NSLog(@"第十题");
        NSMutableArray *newarr=[NSMutableArray array];
        for (int i=0; i<5;i++ ) {
            NSString *arrstr=[arr[i] substringFromIndex:7];
            [newarr addObject:arrstr];
        }
        [newarr sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
           int n1=[obj1 intValue];
           int n2=[obj2 intValue];
           if (n1>n2) {
               return NSOrderedAscending;
           }
           else if (n1<n2)
           {
               return NSOrderedDescending;
           }
           else
           {
               return NSOrderedSame;
           }
        }];
        for (int i=0;i<newarr.count;i++) {
            NSMutableString *str=[NSMutableString string];
            [str appendFormat:@"String %@",newarr[i]];
            NSLog(@"%@",str);
        }
        
    }
    return 0;
}