I am a java programmer, I found that Java is very good at doing string.
If I want to do this objective c, how can I do in objective c ?
System.out.println("This is a " + 123 + " test");
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2 Answers
To place an integer into a string, you can do this:
int n = 123;
NSString *s = [NSString stringWithFormat:@"This is a %d test", n];
There are numerous other ways. But concatenating strings with integers by + operator is not one of them. :)
6 Comments
David Gelhar
And for printing debugging output to the console, NSLog() is your friend.
Seva Alekseyev
As in, NSLog(CFSTR("This is a %d test"), n); The difference of syntax has to do with the fact that NSString is an Objective C class with methods, and NSLog is a C function.
Dave DeLong
@Seva that works, but it's much easier to do:
NSLog(@"This is a %d test", n); Even though NSLog is a C function, it takes NSString*,... as its arguments.Seva Alekseyev
You know... conceptual purity :) I'm pretending CFString and NSString are distinct, even though they're the same.
Wevah
But you can have C functions that take objective C objects that don't have Core Foundation equivalents…
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To place an integer into a string, you can do this:
int number = 123;
NSString *string = [NSString stringWithFormat:@"This is a %i test", number];
Or if you want to NSLog you have to do this :
int number = 123;
NSLog(@"This is a %i test", number);
It is very EASY !!!
