Conclusion
C4.5 is used in classification problems and it is the most used algorithm for builing DT.
It is suitable for real world problems as it deals with numeric attributes and missing values. The algorithm can be used for building smaller or larger, more accurate decision trees and the algorithm is quite time efficient.
Compared to ID3, C4.5 performs by default a tree pruning process, which leads to smaller trees, more simple rules and more intutive interpretations