Programming in Objective-C, Sixth Edition

More on the NSLog Function

Program 15.3, which follows, shows how to define an NSString object and assign an initial value to it. It also shows how to use the format characters %@ to display an NSString object.

Program 15.3

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#import <Foundation/Foundation.h>int main (int argc, char * argv[]){   @autoreleasepool {      NSString *str = @"Programming is fun";      NSLog (@"%@", str);   }   return 0;}

Program 15.3 Output

Programming is fun

In the line

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NSString *str = @"Programming is fun";

the constant string object Programming is fun is assigned to the NSString variable str. Its value is then displayed using NSLog.

The NSLog format characters %@ can be used to display not just NSString ...