2014-02-1222:
41:
43.89305.字符串[1560:
303]字符串大写:
THISISSTRINGA
2014-02-1222:
41:
43.89305.字符串[1560:
303]字符串小写:
thisisstringa
2014-02-1222:
41:
43.89305.字符串[1560:
303]字符串截取:
thi
2014-02-1222:
41:
43.89405.字符串[1560:
303]字符串截取:
isstringA
2014-02-1222:
41:
43.89405.字符串[1560:
303]字符串截取:
isstrin
2014-02-1222:
41:
43.89405.字符串[1560:
303]字符串截取:
isstrin
2014-02-1222:
41:
43.89505.字符串[1560:
303]字符串查找:
stringA位于thisisstringA第:
8个字符,长度为:
8
2014-02-1222:
41:
43.89505.字符串[1560:
303]字符串查找:
thisisstringB中不存在stringA
Programendedwithexitcode:
0
Object-C中的数字对象
1.#import
2.
3.int main(int argc, const charchar * argv[])
4.{
5.
6. @autoreleasepool {
7.
8. /*
9. Object-C中的数字对象:
10. 1.int,float,long,double等都是Object-C中的基本数据类型,不是对象,也就是说不能够向他们发送消息。
11. 2.有时需要将值类型作为对象使用,如NSArray,要求存储的必须是对象,因此不能直接将基本数据类型放入数组。
12. 3.如果需要存储基本数据类型(包括char),可以使用NSNumber类。
13. */
14.
15. NSNumber *intNumber,*longNumber,*floatNumber,*charNumber,*doubleNumber;
16.
17. //int型值
18. intNumber=[NSNumber numberWithInt:
100];
19. NSLog(@"%i",[intNumber intValue]);
20.
21. //long型值
22. longNumber=[NSNumber numberWithLong:
0xabcdef];
23. NSLog(@"%lx",[longNumber longValue]);
24.
25. //char型值
26. charNumber=[NSNumber numberWithChar:
'A'];
27. NSLog(@"%c",[charNumber charValue]);
28.
29. //float型值
30. floatNumber=[NSNumber numberWithFloat:
100.00];
31. NSLog(@"%g",[floatNumber floatValue]);
32.
33. //double型值
34. doubleNumber=[NSNumber numberWithDouble:
12345e+15];
35. NSLog(@"%lg",[doubleNumber doubleValue]);
36.
37. //验证两个值是否相等
38. if([intNumber isEqualToNumber:
floatNumber]==YES)
39. {
40. NSLog(@"%i和%g比较,值相等",[intNumber intValue],[floatNumber floatValue]);
41. }
42. else
43. {
44. NSLog(@"%i和%g比较,值不等",[intNumber intValue],[floatNumber floatValue]);
45. }
46.
47. //两个值比较大小
48. if([intNumber compare:
floatNumber]==NSOrderedAscending)
49. {
50. NSLog(@"%i和%g比较,第一个数<第二个数",[intNumber intValue],[floatNumber floatValue]);
51. }
52. else
53. {
54. NSLog(@"%i和%g比较,第一个数≥第二个数",[intNumber intValue],[floatNumber floatValue]);
55. }
56. }
57. return 0;
58.}
输出结果:
2014-02-1221:
59:
34.84704.数字[1229:
303]100
2014-02-1221:
59:
34.84904.数字[1229:
303]abcdef
2014-02-1221:
59:
34.84904.数字[1229:
303]A
2014-02-1221:
59:
34.85004.数字[1229:
303]100
2014-02-1221:
59:
34.85004.数字[1229:
303]1.2345e+19
2014-02-1221:
59:
34.85004.数字[1229:
303]100和100比较,值相等
2014-02-1221:
59:
34.85104.数字[1229:
303]100和100比较,第一个数≥第二个数
Programendedwithexitcode:
0
Object-C中的字符串对象2-可变字符串
1.//
2.// main.m
3.// 字符串-可变字符串
4.//
5.// Created by zhangqs008 on 14-2-13.
6.// Copyright (c) 2014年 zhangqs008. All rights reserved.
7.//
8.
9.#import
10.
11.int main(int argc, const charchar * argv[])
12.{
13.
14. @autoreleasepool {
15.
16. NSString *str1=@"this is string A";
17. NSString *search;
18. NSString *replace;
19. NSMutableString *mutableStr;
20. NSRange subStr;
21.
22. //01.从不可变字符串创建可变字符串
23. mutableStr=[NSMutableString stringWithString:
str1];
24. NSLog(@"01 %@",mutableStr);
25.
26. //02.插入字符,注意:
是直接修改的字符串对象,无返回值
27. [mutableStr insertString:
@" mutable" atIndex:
7];
28. NSLog(@"02 %@",mutableStr);
29.
30. //03.插入末尾进行有效拼接
31. [mutableStr insertString:
@" and string B" atIndex:
[mutableStr length]];
32. NSLog(@"03 %@",mutableStr);
33.
34. //04.直接用appendString
35. [mutableStr appendString:
@" and string C"];
36. NSLog(@"04 %@",mutableStr);
37.
38. //05.根据范围删除字符串 deleteCharactersInRange(从*开始,删除*个字符)
39. [mutableStr deleteCharactersInRange:
NSMakeRange(16,13)];
40. NSLog(@"05 %@",mutableStr);
41.
42. //06.查找然后将其删除
43. subStr=[mutableStr rangeOfString:
@"string B and "];
44. if(subStr.location!
=NSNotFound)
45. {
46. [mutableStr substringWithRange:
subStr];
47. NSLog(@"06 %@",mutableStr);
48.
49. }
50.
51. //07.直接设置为可变字符串
52. [mutableStr setString:
@"this is string A"];
53. NSLog(@"07 %@",mutableStr);
54.
55. //08.替换一些字符
56. [mutableStr replaceCharactersInRange:
NSMakeRange(8, 8) withString:
@"a mutable string"];
57. NSLog(@"08 %@",mutableStr);
58.
59. //09.查找和替换
60. search=@"this is";
61. replace=@"An example of";
62.
63. subStr=[mutableStr rangeOfString:
search];
64. if(subStr.location!
=NSNotFound)
65. {
66. [mutableStr replaceCharactersInRange:
subStr withString:
replace];
67. NSLog(@"09 %@",mutableStr);
68. }
69.
70. //10.查找和替换所有匹配项
71. search=@"a";
72. replace=@"X";
73. subStr=[mutableStr rangeOfString:
search];
74. while (subStr.location!
=NSNotFound) {
75. [mutableStr replaceCharactersInRange:
subStr withString:
replace];
76. subStr=[mutableStr rangeOfString:
search];
77. }
78. NSLog(@"10 %@",mutableStr);
79.
80. //也可以这样写
81. [mutableStr replaceOccurrencesOfString:
search withString:
replace options:
nil range:
NSMakeRange(0, [mutableStr length])];
82.
83. NSLog(@"10 %@",mutableStr);
84.
85.
86.
87. }
88. return 0;
89.}
输出结果:
2014-02-1320:
38:
30.07405.字符串-可变字符串[997:
303]01thisisstringA
2014-02-1320:
38:
30.07605.字符串-可变字符串[997:
303]02thisismutablestringA
2014-02-1320:
38:
30.07905.字符串-可变字符串[997:
303]03thisismutablestringAandstringB
2014-02-1320:
38:
30.07905.字符串-可变字符串[997:
303]04thisismutablestringAandstringBandstringC
2014-02-1320:
38:
30.08005.字符串-可变字符串[997:
303]05thisismutablestringBandstringC
2014-02-1320:
38:
30.08005.字符串-可变字符串[997:
303]06thisismutablestringBandstringC
2014-02-1320:
38:
30.08105.字符串-可变字符串[997:
303]07thisisstringA
2014-02-1320:
38:
30.08105.字符串-可变字符串[997:
303]08thisisamutablestring
2014-02-1320:
38:
30.08105.字符串-可变字符串[997:
303]09Anexampleofamutablestring
2014-02-1320:
38:
30.08205.字符串-可变字符串