ios - 一道OC练习题

Question

/usr/share/dict/propernames 文件保存着常见专有名词。/usr/share/dict/words 文件保存着常用的单词（不包含专有名词），请找出既是常见专有名词又是常用单词的字符串，例如Glen是男名，glen指狭长的山谷。

求解答，谢谢。

Answer 1

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {

        // (1) Read in propernames file as a huge string
        // convert *namesList to lowercaseString so that I can find the matched words
        NSString *namesList = [[NSString stringWithContentsOfFile:@"/usr/share/dict/propernames"
                                                         encoding:NSUTF8StringEncoding
                                                            error:NULL] lowercaseString];

        // (2) Read in words file as a huge string
        NSString *wordsList = [NSString stringWithContentsOfFile:@"/usr/share/dict/words"
                                                        encoding:NSUTF8StringEncoding
                                                           error:NULL];

        // (3) Break them into arrays of strings
        NSArray *names = [namesList componentsSeparatedByString:@"\n"];
        NSArray *words = [wordsList componentsSeparatedByString:@"\n"];

        // (4) Use 'fast enumeration' to check the duplicates
        for (NSString *n in names ) {
            for (NSString *i in words) {
                // Look for duplicates
                if ([n isEqualToString:i] == YES) {
                // Print them if found
                    NSLog(@"\n%@ is a duplicate.\n", i);
                }
            }

    }
    return 0;
}
}

Answer 2

文件内容是什么格式的数据？

Answer 3

从文件读取出数据放到数据，然后两个for循环遍历两个数组进行比较，有相同的就放到一个新的可变数组里