OC-数组类-几道练习

3.有两个字符串@"I am a good girl";@"You are a bad boy"; 将这两个字符串单词,交叠,形成系的字符串 @"I You am are a a good bad girl boy"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
         char str1[100] = {};
        char str2[100] = {};
        //按格式输入：%[^
] 解释：表示除了'
'所有字符都被视为字符串的一部分,】'
'：读取到'
'时，为第二个字符串输入
        scanf("%[^
]
%[^
]",str1,str2);
        NSString *string1 = [NSString stringWithUTF8String:str1];
        NSString *string2 = [NSString stringWithUTF8String:str2];
        
        NSLog(@"string1 = %@",string1);
        NSLog(@"string2 = %@",string2);
        
        NSArray *array1 = [string1 componentsSeparatedByString:@" "];
        NSArray *array2 = [string2 componentsSeparatedByString:@" "];
        NSUInteger len1 = [array1 count];
        NSUInteger len2 = [array2 count];
        NSArray *array = [[NSArray alloc]init];
        NSUInteger len = len1<len2?len1:len2;
        for (int i=0; i<len; i++) {
            array = [array arrayByAddingObject:[array1 objectAtIndex:i]];
            array = [array arrayByAddingObject:[array2 objectAtIndex:i]];
        }
        
        //获取比较长的字符串的剩余子串
        NSArray *subArray = [NSArray array];
        if (len1 > len2) {
            subArray = [array1 subarrayWithRange:NSMakeRange(len, len1-len)];
        }else{
            subArray = [array2 subarrayWithRange:NSMakeRange(len, len2-len)];
        }
        
        NSArray *resArray = [array arrayByAddingObjectsFromArray:subArray];
        NSString *resString = [resArray componentsJoinedByString:@" "];
        NSLog(@"%@",resString);   
    }
}    

 2.对称字符串

 传入一个字符串,将这个字符串组合成一个新的对称字符串返回

 例如:

 传入:@"I love you Mery"

 返回:@"I love you Mery Mery you love I"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        //以字符串整体进行分割
        NSString *src = @"I love you Mery";
        NSArray *array = [src componentsSeparatedByString:@" "];
        NSArray *retArray = [[NSArray alloc] initWithArray:array];
        //1.method:第一种for循环遍历
        /*
        NSUInteger len = [array count];
        for (NSInteger i=len-1; i>=0; i--) {
            retArray = [retArray arrayByAddingObject:[array objectAtIndex:i]];
        }
        NSString *resString = [retArray componentsJoinedByString:@" "];
        NSLog(@"%@",resString);
         */
        //2.第二种枚举器遍历
        /*
        NSEnumerator *reverseEnumerator = [[NSEnumerator alloc] init];
        reverseEnumerator = [array reverseObjectEnumerator];
        id obj = nil;
        while (obj = [reverseEnumerator nextObject]) {
            retArray = [retArray arrayByAddingObject:obj];
        }
        NSString *resString = [retArray componentsJoinedByString:@" "];
        NSLog(@"%@",resString);
         */
    }
}