记录OC学习的一点一滴（二）

NSString 基础练习：

代码：

//

//  main.m

//  NSStringDemo01

//

//  Created by Levi on 14-3-14.

//  Copyright (c) 2014年 levi. All rights reserved.

//



#import <Foundation/Foundation.h>



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

{



    @autoreleasepool {

        

        /*

         NSString

         NSArray

         NSDictionary

         */

        char *s = "Hello World";

        NSString *str1 = @"Hello World";

        NSLog(@"s is %s str1 is %@", s, str1);

        

        

        //NSString *str3 = [[NSString alloc] initWithString:@"Hello World"];

        /* c 类型字符串转化成 oc NSString */

        NSString *str2 = [[NSString alloc] initWithCString:s encoding:NSUTF8StringEncoding];

        const char *p = [str2 UTF8String];

        NSLog(@"str2 is %@ p is %s", str2, p);

        

        

        NSString *str3 = [NSString stringWithFormat:@"%s%d%c%f", "sss", 10, 'c', 3.14];

        NSLog(@"str3 is %@", str3);

        

        

        NSString *str4 = @"10";

        int a = str4.intValue;

        NSLog(@"a is %d", a);

        NSLog(@"strlen is %ld", str3.length);

        

        

        NSString *str5 = @"wahaha";

        NSString *str6 = @"wahaha";

        NSLog(@"cmp : %d", [str5 isEqualToString:str6]);

        

        

        NSString *s1 = @"My name is";

        NSString *s2 = @"Levi";

        NSString *s3 = @"I am 24";

        NSString *s4 = [NSString stringWithFormat:@"%@ %@ %@", s1, s2, s3];

        NSLog(@"%@", s4);

        

        

        NSString *s5 = @"145";

        NSString *s6 = @"151";

        int result = [s5 compare:s6];

        NSString *s7 = @"NSOoerdefadfLeviadlfkj, usidfja, dfdfddl";

        NSRange range = [s7 rangeOfString:@"td"];

        /* 判断条件 */

        NSLog(@"NSNotFount is %ld", NSNotFound);

        

        

        if(range.location == NSNotFound && range.length == 0)

            NSLog(@"NO found!");

        else NSLog(@"location is %ld length is %ld", range.location, range.length);

        NSString *s8 = @"Welcome to Bejing";

        NSRange range2 = {3, 6};

        NSString *s9 = [s8 substringWithRange: range2];

        NSLog(@"%@", s9);

        

        

        NSString *s10 = [s8 substringFromIndex:s8.length-6];

        NSLog(@"%@", s10);

        

        

        NSString *s11 = @"When I was young, I loved a girl on neighbor class.";

        NSRange range3 = [s11 rangeOfString:@"was"];

        NSRange range4 = [s11 rangeOfString:@"girl"];

        NSRange range5;

        range5.length = range4.location - range3.location + range4.length;

        range5.location = range3.location;

        NSString *s12 = [s11 substringWithRange:range5];

        NSLog(@"%@", s12);

        

        NSString *s13 = @"Welcome to Qianfeng";

        NSRange range6 = [s13 rangeOfString:@"to"];

        NSString *s15 = [s13 substringToIndex:range6.location-1];

        NSString *s16 = [s13 substringFromIndex:range6.location+range6.length];

        NSString *s14 = [NSString stringWithFormat:@"%@%@", s15, s16];

        NSLog(@"%@", s14);

        

        NSString *s17 = @"Hello world";

        NSRange range7 = [s17 rangeOfString:@"Hello"];

        NSRange range8 = [s17 rangeOfString:@"world"];

        NSString *s19 = [s17 substringWithRange:range7];

        NSString *s20 = @"qianfeng";

        NSString *s21 = [s17 substringWithRange:range8];

        NSString *s18 = [NSString stringWithFormat:@"%@ %@ %@", s19, s20, s21];

        NSLog(@"%@", s18);

        

        NSString *s22 = @"When I was young, I loved a girl on neighbor class. ";

        NSRange range9 = [s22 rangeOfString:@"young"];

        NSRange range10 = [s22 rangeOfString:@"girl"];

        NSString *s23 = [s22 substringToIndex:range9.location];

        NSString *s24 = [s22 substringFromIndex:range10.location+range10.length];

        NSString *s25 = @"teacher, I rather teaching the students";

        NSString *s26 = [NSString stringWithFormat:@"%@%@%@", s23,s25,s24];

        NSLog(@"%@", s26);

    }

    return 0;

}