Introduction - If you have any usage issues, please Google them yourself
Suitable for beginners c language applet. For example, the topic: There are 1,2,3,4 digits, how many can be composed of mutually exclusive and non-duplication of the same three-digit numbers? How many are? 1. Program analysis: can be filled in the 100, 10, single-digit figures are 1,2,3,4. Composed of all the order and then remove the conditions are not satisfied with the arrangement.