Comparing two version numbers

Question

How to compare two lines of version number?

For example: 3.1.1 and 3.1.2.5.4

Now I need to find out if 3.1.2.5.4 is higher than 3.1.1, but I do not know how to do this. Can anybody help me?

Thanks in advance!

Answer 1

Code example:

NSString* v1 = @"3.1.1"; NSString* v2 = @"3.1.2.5.4"; if ([v1 compare:v2 options:NSNumericSearch] == NSOrderedDescending) { NSLog(@"%@ is greater than %@",v1,v2); } 

From Apple documentation for Compare and Sort Strings .

Answer 2

Yes, you can compare versions, see the code below:

 public class Comparision { string ver1, ver2; public static void main(String args[]){ string ver1Split[] = ver1.split('.'); string ver2Split[] = ver2.split('.'); for (int i = 0; i < ver1Split.length; ++i) { if (ver2Split == i) { return ver1 + " is larger"; } if (ver1Split[i] == ver2Split[i]) { continue; } else if (ver1Split[i] > ver1Split[i]) { return ver1 + " is larger"; } else { return ver2 + " is larger"; } if (ver1Split.length != ver2Split.length) { return ver2 + " is larger"; } return "versions are equal"; } }