Objective-C NSString: several methods for creating and initializing nsstring

Objective-C NSString: several methods for creating and initializing nsstring
1 # import <Foundation/Foundation. h>
2
3 int main (int argc, const char * argv [])
4 {
5
6 NSAID utoreleasepool * pool = [[NSAID utoreleasepool alloc] init];
7 // get string encoding and error parameters from the file
8 NSStringEncoding encoding = NSUTF8StringEncoding;
9 NSError * error = [[NSError alloc] init];
10
11 // define the initialization string 1
12 NSString * str1 = @ "wxiao ";
13 // define the initialization string 2
14 NSString * str2 = [NSString stringWithString: @ "xiaow"];
15 // define the initialization string 3
16 NSString * str3 = [[NSString alloc] initWithString: @ "objc"];
17 // define the initialization string 4
18 NSString * str4 = [NSString stringWithFormat: @ "% @ and % @", str1, str3];
19
20 // define the initialization string 5
21 NSString * str5 = [NSString stringWithContentsOfFile: @ "test" encoding: encoding error: & error];
22
23 NSLog (@ "% @", str1 );
24 NSLog (@ "% @", str2 );
25 NSLog (@ "% @", str3 );
26 NSLog (@ "% @", str4 );
27 NSLog (@ "% @", str5 );
28
29 [pool drain];
30
31 return 0;
32}