I am a java programer, I found that the Java is very gd 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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52answers:
2
+5
A:
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. :)
Seva Alekseyev
2010-03-16 14:38:23
And for printing debugging output to the console, NSLog() is your friend.
David Gelhar
2010-03-16 14:40:06
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.
Seva Alekseyev
2010-03-16 14:44:47
@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.
Dave DeLong
2010-03-16 15:10:44
You know... conceptual purity :) I'm pretending CFString and NSString are distinct, even though they're the same.
Seva Alekseyev
2010-03-16 15:30:25
But you can have C functions that take objective C objects that don't have Core Foundation equivalents…
Wevah
2010-03-16 20:35:35
Well, yeah... so what? NSLog is documented to take a CFStringRef as a parameter. So I gave it one.
Seva Alekseyev
2010-03-16 20:57:32
A:
To simply print to the console you could try:
int num = 123;
printf("This is a %i test", num);
Leom Burke
2010-03-16 14:40:26