printing int with specified nr of digits

Question

I am trying to print out a 5 digit number as follows:

int rdmNr = arc4random()%100000;
NSLog(@"%i",rdmNr);

I always would like to have 5 digit numbers. Example outputs should be:

00001
10544
00555
78801

But with the previous code I would also get 1 or 555 without 0s. I also tried %5i, but the I just get more white spaces.

Answer 1

try

NSLog(@"%05i",rdmNr);

In general, you can specify 2 types of padding for NSLog - filling the required extra characters with spaces (@"%5i") or with leading zeros (@"%05i")

Answer 2

NSLog(@"%05i", rdmNr);

The 5 means that 5 characters should be printed, the 0 means that it should be padded with zeros to the left.

NSLog accepts the same arguments as printf (see here) in addition %@ prints an NSString, more info here.

Answer 3

You can also find some common specifiers at Placeholders on Wikipedia