Small white Learning Development (IOS) OC_ string comparison judgment (2015-08-12)

//

Main.m

// string comparison judgment

//

Created by admin on 15/8/13.

Copyright (c) years admin. All rights reserved.

//

#import <Foundation/Foundation.h>

int Main (int argc,const Char * argv[]) {

@autoreleasepool {

//1. Determines whether a string is empty

nsstring *str = @ "";

if (str = = Nil | | str.length = =0) {

NSLog (@ " string is empty ");

}

//2. Determines whether a string starts with the specified content

nsstring *str1 = @ "www.baidu.com";

BOOL isperfix = [str1 hasprefix:@ "RWW"]; //Perfix prefix

if (Isperfix) {

NSLog (@ " starts with ww ");

}Else

{

NSLog (@ " start error ");

}

NSLog (@ "Hasperfix%@", Isperfix? @ "YES": @ "NO"); optimization of the above judgment

//3. Determines whether a string ends with the specified content

In the development of commonly used in judging file formats such as:. txt. AVI,.RMVB mkv Doc mp3,mp4 PDF

BOOL issuffix = [str1 hassuffix:@ "com"]; //suffix suffix

NSLog(@ "Hassuffix%@", Issuffix? @ "YES" : @ "NO");

/ * 4. Determine if two strings are equal

Note:

> uses = = To determine two strings, in fact, to determine whether the address of two strings is equal

> If the addresses are equal, then the strings are equal

> However, in the actual development, remember not to use = = To determine the two strings of equal

> to determine if two strings are equal , you must use the method that NSString provides to us

Isequaltostring

*/

nsstring *str2 = @ "ABCDEFGH";

nsstring *STR3 = @ "abcdeeee";

BOOL isequal = [str2 isequaltostring: STR3];

NSLog (@ "IsEqual%@", isequal?) @ "YES" : @ "NO");

/*

5. Isequaltostring 's enhanced version compare

> Compare compares ASCII values

> The return value is an enumeration

*/

nscomparisonresult result = [str2 compare: STR3];

Switch (Result) {

casensorderedascending:

NSLog(@ "nsorderedascending");

break;

Case nsorderedsame:

NSLog (@ "Nsorderedsame");

break;

casensordereddescending:

NSLog(@ "nsordereddescending");

break;

default:

break;

}

}

return 0;

}

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Small white Learning Development (IOS) OC_ string comparison judgment (2015-08-12)