Features of Bottom-up technique in C language

Program preparation starts from designing the sub-problems.
The solutions are clubbed in the main coordinating module.
The composition of solutions is generalized for main solution.
Program is structured as hierarchy of various tasks but viewed from bottom to upper level.
As the technique moves from bottom to top it is a type of generalization.
Main module can only be designed after the detailed design of sub-problems.
The tested sub-programs are used to frame the main solution.
Integration test is performed at the final stage of programming.
The code of the sub-problems are reusable.
The modules linking details is not available at the lower stage of programming.
This type of programming technique is most popular in Object Oriented Programming using C++ and Java.